![]() My car has a manual transmission, so I just transferred the flywheel/clutch assembly and reused the flywheel bolts from the MT. The JDM engine did not have a flywheel installed - it did have an automatic transmission plate though. The B21A1 only has 1 oxygen sensor and it is located on the B-pipe. It also had 2 oxygen sensors connected at the front of the exhaust manifold (both sensors were crushed anyway). The JDM engine does not have a connection for the EGR pipe because it doesn't have an EGR valve). I wanted to avoid tripping the check engine light. The only difference is the internals.Įven though the JDM engine came with the intake and exhaust manifolds, I wanted to use the B21A1 manifolds because it had the correct connections (EGR valve, O2 sensor, cruise control vacuum source, etc.). Everything bolts up directly to the JDM engine because it is the same block and head. Most of the engine components will need to be transferred from the B21A1 engine to the JDM B20A. You will not want to change the parts out later on once the engine is installed and the parts are harder to get to. Hi-temp wheel bearing grease or silicone greaseĪlthough there are a lot of parts to buy, keep in mind that it is much easier to change out the parts with the engine out of the car and within easy reach. My parts list included:Ĭlutch disc, pressure plate, release bearingĪxle/half-shaft spring clips (inner and outer)Īluminum dowel pins (engine to transmission mating)įluids (Power steering, tranny, clutch, coolant, engine oil) Your shopping list may not be as big as mine. I wanted to make sure that there was not going to be any problems later on. The parts list that I gathered was rather extensive. I also recommend that you purchase all of the necessary genuine Honda parts before starting. With plenty of help and proper equipment, it could probably be done in 3 to 5 full days.īefore starting on the engine swap, I highly recommend that you have the factory Helms manual for reference. I took my time to do it right and carefully torqued all of the nuts and bolts. It took me 2 weeks to perform the swap after work at night and on weekends. ![]() If you have a torch, it may be quite useful for removing the exhaust system. The only help I needed was having someone hold the crankshaft in place while breaking the pulley bolt and the flywheel bolts loose. Extra items to make your life easier include a drop light, clutch pilot tool, large breaker bar (1/2" drive), torque wrenches (1/2" & 3/8"), a ball joint separator (not the wedged fork), plastic or rubber mallet, penetrating lube, and an extra person. I recommend doing this swap in a garage, if possible. And obviously you will need an engine hoist with ratchet straps or a chain. If a lift is not available to you, it can be done with a floor jack and 4 jack stands. It can prevent back injuries and allows you to get the proper leverage on certain parts of the car. A car lift will make your life so much easier, if you have access to one. You will need an impact gun and impact sockets to remove the tight nuts and bolts. ![]() The bulk of the work can be performed with ordinary hand tools (sockets, ratchets, extensions, wrenches, screwdrivers, etc.). Your experiences may be better or worse than mine. This article is based on my personal experiences in swapping the engine on my '90 Prelude Si 4WS. The original 2.0L (USDM B20A5 and JDM B20A) engine did not suffer the same problem. The reason is because the 2.1L engine is notorious for burning oil. This swap is primarily directed towards 1990-1991 Prelude Si owners with the 2.1L (B21A1) engine. This site does not give a detailed step-by-step procedure, instead it gives a general overview of the swap. Hopefully, this article will answer most of those questions. Many people who have thought about performing the swap have a lot of questions. Previously, there has not been an article written about swapping the engine. Over the years, many people have performed a JDM (Japanese Domestic Market) B20A engine swap on the third generation Prelude (1988-1991). For details on how to submit your article, click here. wishes to thank the contributor(s) who provided this article for graciously sharing this information. This information is strictly for educational purposes. , and the authors of this material may not be held responsible for any damages caused to persons or property by following these directions. The contents are the intellectual property of the individual(s) who created them. This article is displayed under special permission. Write up by: Alan - vtecpowerhouse AT yahoo DOT com
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