B21 honda prelude

B21 honda prelude. Feb 1, 2005 · Well, when I called Honda, I had them check a 91 Si with B21 against the B20 from an 88. preludepower. RL-521 Discussion starter 81 posts Feb 3, 2005 · If people drive the b21 like a sports car, it's going to burn oil in its old age. -DC stainless header-B21 intake manifold. 2003 Miata, Emerald Mica The new Honda Prelude 20+ members. Like. i orderd a SPEC stage 2 clutch, i pulled off the flywheel from the b21 and tried to fit the clutch on it. L. you can use a b21 head with a b20 block, b20 Mar 14, 2013 · 2011 Honda CR-Z - DD 1991 Honda Prelude SE - LEATHER SEATS BABY - H22 - 180whp - 160tq Mar 15, 2003 · A forum community dedicated to Honda Prelude owners and enthusiasts. Simple as that. Threw a connecting rod and busted the block I am rebuilding and swapping to a 5 speed. Jan 23, 2003 · preludepower. -New set of B21 valve springs-B18B intake cam-B21 exhaust cam-B18 AEM cam gears, currrently set to 0,0. Nov 9, 2004 · here's a dyno graph of a 3g i tuned a few years ago that had b21 pistons in a b20 block, b20 head ported and polished, mild cams, b21 intake manifold that was mildly ported, 60mm TB (stock is 55. And since I'm using my original b21 tranny, I know this all must work with my transmission when I put it all together. Jan 31, 2005 · b20 heads are a direct bolt on to a b21 block. it took them a while to do the job,now that they know how they are welcomeing anyone to give them a call 1860 228 3449 turn around time Apr 8, 2021 · The B21 also introduces FRM cylinder wall liners (Fiber Reinforced Metal, which is also used in the 3. , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada May 25, 2004 · A forum community dedicated to Honda Prelude owners and enthusiasts. 2. Oct 1, 2012 · its not complicated, just get a 3rd gen prelude obd0 to obd1 conversion harness from 1funryd vendor forum for 80$, hook up a 4 wire 02 sensor and bung and your done. stock b20 compression is 9. so what your saying is take the ecu out of the b21 car buy the harness and done. e. May 21, 2003 · To rebuild a B21, which i have been looking into is any where from 2200 to 3000. When I checked my ignition timing with the P75 and B21 distributor it was way off. 9M posts 62K members Since 2002 A forum community dedicated to Honda Prelude owners and enthusiasts. B20s love boost and thats why they are more desirable. it will bring your stock b21 compression up from 9. This is the common cause of all the b21s found in the 90-91 prelude smoking, performing poorly, and eating more and more oil. 2L NSX engine). Most cylinder walls are made of iron, but Honda experimented with FRM as it provides less friction and has much better heat transfer qualities than iron, resulting in a more efficient cooling system May 6, 2003 · 2011 Honda CR-Z - DD 1991 Honda Prelude SE - LEATHER SEATS BABY - H22 - 180whp - 160tq oversize pistons same size as i would in the b21, like i said be4, i think Jan 9, 2005 · reinforced pistons for diesel engines,while Honda Motor Company focused on the reinforcement of engine blocks. tested at 500 miles 175 202 202 202. I measured my B21 sensors at about 1k ohms and the LS sensors at 250 ohms. tested 140 190 190 190 when i got it. com is an independent Honda enthusiast website owned and operated by VerticalScope Inc. I was planning on using the b21 flywheel and tranny on the b20a5, will it work???? May 20, 2007 · ok so i have a 1990 prelude B21A1 and i need to know if i should put money into it. " Dec 29, 2008 · 1991 Honda Prelude Si. ive searched long and hard for these diagrams so anyone who could let me know why the service manuel is not opperational or give me a link for the diagrams would be greatly appreacieated. Mar 20, 2010 · preludepower. I am looking to build a mild street machine thats a daily driver. 6:1. Come join Jun 14, 2003 · My JDM b20a also sits in my garage. In 1990,Honda launched a new generation of aluminum engine blocks with fibre reinforced cylinder walls replacing traditional cast iron liners. . :?: I also saw that hondaautomotiveparts. so using a b21 gasket will provide better cooling than a b20 gasket. b20 head on b21 block raises compression to about 10. bearings, pistons, rings, rods, valves and retainers and all that. He said they where the same. I want to say something like 13 grams per valve assembly, but again, it's been a long time. tested after dyno 175 175 175 199. The B21 came on all 90-91 Si's (Not the 2. and make sure you readjust the valve-train Mar 25, 2010 · ive got a 1990 si the stock b21 is on the floor and my new b20a5 is ready to be droped in. com had different reference numbers for injectors (but remember that's not Honda's part number). ase_master327 Jul 31, 2008 · the b21 lude in this thread: bought with 221k. May 2, 2009 · The 88-91 Prelude B20A and B21A blocks are cast so they lay at an 18-degree angle leaning towards the firewall. 0L) and new fuel injection. i suggest using the b21 cams though, or at least the b21 exhaust cam. the clutch didnt fit. Started the swap tonight. Jun 23, 2008 · if your using the b21 head/intake mani then you should use the b21 ecu, if its the whole b20 in there use the b20 ecu. Content on preludepower. they are FRM sleeves. so the b20 and b21 engines do not have the same block. I have a 1991 Honda Prelude SR A. The Honda B20A engine series, known as the B20A and B21A, was an inline four-cylinder engine family from Honda introduced in 1985 in the second-generation Honda Prelude. with a B21a1. 88-91 Prelude - Disconnecting of Ball Joints: Upper, Tie Rod, Lower Ball Joints (MustardCat video) 141. R. Previous b21a1 was hydrolocked to death - so installing a new b21a1 that'll have a port and polish, some headwork done, as well as little tricks done. but tomorrow Jul 17, 2007 · turbo b21,first its alot easier,second less money better results,3rd you can push way more hp on the boosted b21 for way less money then to put in a h22,vtec is nice and all and i think anyone who has done the swap gets my respect but i think its a lot of money and time when with a cheap 1000$ turbo setup maybe less if you look around more boosting 7psi -10 you can put down around 230-250 whp Mar 15, 2012 · spiffyguido Moderator Posts: 2196 Joined: Fri Nov 11, 2005 9:55 am Prelude Model: 1991 SE-SR Location: Alberta, Canada Jun 19, 2011 · yes the b21 header will fit the b20a but youll have to do an o2 sensor swap which isent too hard. Its just that the B21 sleeve is made of the FRM material or is plated with the FRM material. i also want to do this. thanks May 15, 2009 · 2 year AA degree in Automotive Technology ASE Master certified Import technician since 1999 1990 SI 4ws: B21 block de-stroked to 89mm, bored to 85mm = 2020cc's 161whp, 145wtq Mar 9, 2005 · A forum community dedicated to Honda Prelude owners and enthusiasts. Classic JDM cars and motorcycles. 0, stock b21 compression is 9. Sep 27, 2007 · preludepower. now they are all interchangeable, i. 1989 Honda Prelude H22 . I need to know all the available Connecting Rods that can be used. It is a reworked version of the B20A5 from the 1988-1989 Prelude. Come join the discussion about performance, modifications, engine builds, troubleshooting, maintenance, VTEC, and more! Show Less Dec 10, 2006 · Do anybody have info on how to wire up a 1990-1991 Prelude with B20 or B21 wire (Engine Wire Harness in the engine bay) to the H22 (Engine Harness) wiring for the H22 swap. Haven't messed with these yet. It Dec 21, 2007 · The b21 smokes worser than a crack attic due to the FRM that eats piston rings. the "bore" of the motor is in fact on the block of the motor and not the head. they purchased the sleeves from AEBS and custom machened the sleevs to fit. in the FAQ the 90-91 service manuel sends me to a random link that has no info related to cars let alone the Lude. I am about to buy a Honda Prelude SI from 1991 and need help to identify the engine code. it needs some body work but a body kit could hide most of the rust that is started,but mainly i need to know if the engine is even worth puttin money into it. Save Share. My chassisnumber is JHMBA4153MC004280 and I shared some pictures. Aug 24, 2011 · 1990 SI 4ws: B21 block de-stroked to 89mm, bored to 85mm = 2020cc's 161whp, 145wtq A forum community dedicated to Honda Prelude owners and enthusiasts. Sold concurrently with the D-series which were primarily SOHC engines designed for more economical applications, the B-series were a performance option featuring dual overhead cams along with the first application of Honda's VTEC system (available in some models), high-pressure die cast Feb 9, 2007 · 88-91 Honda Prelude - Automatic to Manual 5 speed swap (MustardCat video) 139. 1989' prelude 4ws SI Custom h22/b20 hybrid intake mani, chipped P06 ecu. Apr 8, 2021 · 1990 is the first year of the B21A1 twin cam engine – the biggest engine ever offered on the 3rd generation Prelude. 88-91 Prelude - B20A/a5 and B21a1/A intake and exhaust valve sizes 142. This is my experience. So is the B20 or B21 better? Customer: how do i replace a timing belt on a 90 honda prelude it has the b21 motor. , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada Feb 16, 2009 · ive been looking since 8 AM for the dam b21 vacuum diagrams. this substance, being very hard, chews up rings when not maintained properly. I trying looking and asking around and ofcourse I turn to reddit to see if anyone has any idea. Come join the discussion about performance, modifications, engine builds, troubleshooting, maintenance, VTEC, and more! Show Less Aug 14, 2008 · to use a pk3 b21 ecu, you'd need the 3g prelude specific conversion harness as well though. The first model selected for production was the Prelude Si,a Apr 14, 2003 · am i reading this post wrong because it's contradicting itself. Find many great new & used options and get the best deals for Cometic C4586040 Prelude B21 A1 84 Mm for Honda at the best online prices at eBay! Free shipping for many products!. we're not b21 "haters. so who knows whats going on with it lol, its a b21 with 223k on it now haha. that is the exact reason why i ALWAYS use a b21 gasket, no matter what motor or hybrid setup im using it on. Im building a b21. B21a1 Automatic. 4[/quote] so my question is how much how much hp gain or loss if any do i get from a b21 head on a b20 block compared to a stock b21 Feb 5, 2005 · I originally had a B20A5, but I swapped it to the B21 for the extra displacement and for the small boost in power. you say that the b21 starts off with a bigger bore which is correct. Mar 17, 2004 · As last resort, we might be putting a b20a5 to replace the b21a1 we removed. i am wondering what the overall area of the b21 single runner is compared to the total of the dual runners on the b20. This is why it was the first honda engine to use the FRM cylinder linings. 3rd Gen Oct 24, 2004 · yes the runners are bigger, but that would drown the motor at lower rpm's. com is not in any way affiliated with Honda Motor Company VerticalScope Inc. i think i am gonna have to check that out. Come join the discussion about performance Feb 13, 2009 · I replaced the timing belt, and the intake cam (w b20a intake cam)(b21 block w pk2 head and pk3 intake mani), the car drives great!! even peels out, but it wont idle for nothing, I matched the timing mark with the pointer, set the engine at TDC aligned the cams and locked themAm I like 1 tooth off? The B-series are a family of inline four-cylinder DOHC automotive engines introduced by Honda in 1988. used engine restore, and after 100 miles tested 160 200 200 200. 0:1. Only came in the 1990-1991 Prelude Si. $150 shipped if bought through me (im a boomslang dealer ), $160 shipped if bought directly from boomslang Save Share Jun 30, 2003 · 90s still had the carb'd motor. Come join Apr 6, 2010 · Prelude Forums. Come join the discussion about performance, modifications, engine builds, troubleshooting, maintenance, VTEC, and more! Show Less Dec 10, 2008 · b21 head on b20 block lowers compression to around 8. 88-89 B20A5 Mar 22, 2004 · will a header heat shield off a b21 fit a b20a5? thanks,-charles . And second, the tdc, cyl, and ckp sensors have different resistances. com is generated by its users. Jul 31, 2010 · I have a B21A1 block with a B21 head and cams if I remember right. For one, the rotors are out of phase between the two distributors. I got it rebuilt from scratch with new Honda parts, i. b21=1 o2 sensors on the lower part of the ex mani Jul 26, 2009 · 1988 Honda Prelude Si 4WS (my part-out) 1989 Plymouth Horizon (DD) 1997 VW Golf GTi VR6 (DD) 1990 VW Cabriolet (DD) 1981 Toyota 4x4 Pickup (DD) 1998 Ducati 900SS (DD)yeah, I like to have options and drive something different every day. Answered by ase_master327 in 12 mins 15 years ago. If you drive the prelude like a sports car, the b21 will break down and smoke a lot sooner than most other honda engines. Bore was increased meaning thinner cylinder walls, resulting in a need for a strong cylinder wall material. So: b21 tranny with b20a engine: using b21 flywheel + clutch works. tested today 200 205 150 205. Nov 26, 2010 · Note, the tool for the H22 works on the B20/b21. The second ones on both match Feb 26, 2005 · Even the B21. 1990 Integra 4dr, 92 hatch, 91 hatch, 90 hatch - Sold 1994 Civic Hatchback - Sold 1999 Civic Coupe - Sold 1997 Honda Prelude Type SH - Sold 1998 Civic Coupe - B18B1 swapped Apr 12, 2018 · 91 Prelude Si 2. Jun 26, 2005 · The P75 doesn't like the B21 distributor. it was done by custom deseign and machene. , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada Jun 17, 2006 · Dark Mode; Light Mode; menu Feb 14, 2002 · Third Gen Prelude Discussion Jan 26, 2003 · Dark Mode; Light Mode Mar 18, 2006 · A forum community dedicated to Honda Prelude owners and enthusiasts. this was an excelent macheneing job. This engine replaces the B20A5 motor, producing slightly more power (5hp) thanks to 83mm more displacement (now 2. I was think about making a universal conversation wire plug that is PNP to do the swap and post info after I'm finished. Jul 29, 2006 · preludepower. This engine was recently rebuilt with honda seals, but had a fairly serious leak from the cam seals. 1L AWS 5sp - b20a5 83mm 10:1, P75 intake cam, b21 ex cam, vigor tb, B21 IM/EM, lotta portwork - daily driver Nov 9, 2010 · Honda Prelude Forum. If you look, there are actually 2 reference numbers listed. I replaced them with Napa seals but the leak is just as bad if not worse (2-3 quarts per 150 miles). , 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada Apr 19, 2008 · 1988 Honda Prelude Si 4WS (my part-out) 1989 Plymouth Horizon (DD) 1997 VW Golf GTi VR6 (DD) 1990 VW Cabriolet (DD) 1981 Toyota 4x4 Pickup (DD) 1998 Ducati 900SS (DD)yeah, I like to have options and drive something different every day. If you are asking about other B series engine swaps, then that would be a no. 6mm), dc header and unknown mild exhaust, and integra cai: Mar 1, 2006 · it may not be the first sleeved block out their but as i know it i have the first b21 AEBS sleeved block. 4:1 to ~9. 2011 Honda CR-Z - DD 1991 Honda Prelude SE - LEATHER SEATS BABY - H22 - 180whp Jul 7, 2006 · 1990 SI 4ws: B21 block de-stroked to 89mm, bored to 85mm = 2020cc's 161whp, 145wtq A forum community dedicated to Honda Prelude owners and enthusiasts. In Canada, the 90-91 Prelude S models had the fuel injected B20A5 motor. So if i get a b20 block its getting milled to b21 specs. Dec 12, 2007 · If you are talking about swapping another engine, then The JDM B20A which is a direct bolt up, but you must use all the B21A1 parts like intake manifold, ecu, etc. If you baby it and change the oil like you should, it will run forever -- just like any mechanical system. 94:1. Oct 22, 2004 · ive been browsing other civic/accord forums the last few days and i would always find a topic or a post stating that the 3rd generation prelude B20/B21 series engines are the worst engines honda ever builtso i tried searching for answers why and how everywhere but all i could find is "its a POS engine" or "its junk and gutless" without further explanation Aug 23, 2011 · This saved a pretty significant amount of weight compared to the B21 valves. My b21 flywheel is right now mounted to my b20a, and my b21 clutch will fit on that flywheel. B. ive been told there isnt much aftermarket support for the engine but is the body and suspension setup even going to be able to take alot of power and May 22, 2009 · 1990 Honda Prelude - Loud, low, and slow. but then you say the blocks are the same. 1L instead of 2. Come join the discussion about performance, modifications, engine builds, troubleshooting, maintenance, VTEC, and more! Show Less Nov 13, 2003 · the sleeves in the b21 are not iron. 88-91 Prelude - Front and Rear Brake replacement and maintenance (MustardCat video) 140. i was thinking about taking a b21 mani with me today and see if there was a difference, maybe next time Nov 10, 2006 · b20 heads have smaller coolant passages then the b21 head, but they are still larger than the circles in the b20 gasket. 0Si, just Si); regardless of ALB (Antilock brakes) or 4WSbut you're right, the ALB and 4WS 90-91 models only came with the B21 motor. noxri muuge krl jkknzx swh bny gjxitn uemplk tsecxo ovc