motor

NYCHonda · 02-23-2004, 06:26 PM

Anyone here familiar with Honda engine?

I'm trying to figure out if the Honda J30A4 (2003 & up Accord Coupe) piston, rings, & throttle body fit in the Honda J30A1 engine (1998-2002 Accord Coupe). The bore & stroke of both engines are the same. The J30A4 has higher compression than the J30A1.

Thanks.

aliendude012 · 02-25-2004, 02:34 AM

Hmmm. Generally the honda engines with the same letter/2 digit number code are ver very similar. aka the h22a, h22a1, and h22a4, are all very similar.

in this case, id say that parts for the j30a1 and a4 are interchangable, meaning as much as theyd fit. you mentioned the compression on the a4 being higher than the a1, and swapping internals into the a1 from the a4 will obviously alter the a1's compression. i'd be weary of swapping parts between the two. if you have the time and the interest, id say try it, give it a full leakdown and compression test, and see how things go. it'd probably be ok for a while, but those parts may wear a bit quickly.

NYCHonda · 02-25-2004, 02:38 AM

Yea, the reason why I'm looking for the J30A4 piston because I don't really want to go with aftermarket custom forged piston yet. I don't have the money to resleeve the block which is required to use the forged piston. The J30A4 has higher compression and it's OEM so it won't need the block to be resleeves but what I'm worry is that I can connect the piston to the rods. I'm wondering if the rods between the J30A1 and J30A4 are the same.

aliendude012 · 02-25-2004, 03:02 AM

are you taking these from a junked a4 or something? if so grab the rods as well. otherwise, maybe pick some up from wherever you're getting the other parts. im sure the rods from the a4 will bolt onto the crankshaft. i want to tell you that the rods on the a1 will connect to the pistons on the a4, but i dont know for sure.11

NYCHonda · 02-25-2004, 03:06 AM

No, not a junked J30A4 engine. I'm planning to buy the parts brand new. I personally never seen a totalled 7th generation Accord yet here.

type x · 03-26-2004, 02:10 AM

yeh im a pretty big honda fanatic. The engines are in the same series, but have slight differences. The pistons will fit, but wont work properly. They are slighly differently designed altogether and in order to get them to work properly you will most likely need to get them forged, but in that case why not just get the aftermarket pistons and whatnot. Want to know something cool though, the J30a4 engine will fit in your accord. No problem. If you dont have the problem of worrying about any legal issues surrounded transplanting a new engine in, It would probably be cheaper, and more effective. The mounts should be the same. It should be like a 3 hour swap at most <if your good>.

Trust me hondas are made to swap engines, usually the jdm versions are much beefer than the usdm, because they like to go faster over there even tough they have NO WHERE to do it...

I have a honda 1987 crx which comes with a 1.5L 87 hp D15 engine SOHC... I have a B18c engine from a new accord in it. Fits under the food fine, but it took aftermarket mounts. Anyhow everything fits and its not a sloppy job, looks like thats the way it has always been. I push between a 9 and 10 second quarter mile with no nos and about 15psi of boost.

If you worried about the cops finding out that you have adifferent engine under your hood, cops dont know the differnce between a J30a! and a j30a4, heck i coulnt tell the difference when i saw them, they are basically identical looking. If you worried about the VIN number on the block, you can always "claim" your old engine died and get a title saying your new engines #, but this may affect insurance, highly doubt it though.

NYCHonda · 03-26-2004, 02:25 AM

Thanks for your reply. I decide not to go internal on the Accord since I have another Honda which is a Prelude that I'm working on right now. The reason why I was interested in purchasing the J30A4 piston for my J30A1 engine because it cost a lot more to get a custom forged piston. As with the J30A1 & J30A4, yea I agree with you. They're both look very identical. I'm not sure about this but I think the J30A4 is chain driven though unlike the J30A1 which is belt driven.

As with the B18C engine that you have in your CRX, great choice!!

I do feel that the Honda B18C engine is just so great especially if you want to work on it. In stock form the B18C engine already producing decent amount of horsepower & quite lightweight. I do believe the B18C engine was only available from the factory Honda Integra though. The new Accord Type R / Euro-R came with the K20A iVTEC engine which also a great Honda engine & the previous generation came with the H22A engine which is a great engine but quite a pain in the ass to work on

03-26-2004, 12:34 PM

ITS an accord dont spend that much time it not going to be that much faster.

with the money youre speding on the motor you could buy a CRX or a hatch. you can race accords your wasting time

NYCHonda · 03-26-2004, 12:38 PM

Actually I'm working on a Prelude now. As for CRX or Civic hatch, yea, those are nice. I used to have those few years back.

StanAE86 · 03-28-2004, 12:21 PM

If you're just looking to bump the compression ratio a tad, why not just pull the head and have it shaved a little. From the little that I know about Honda motors, they're already a full contact head, so you're not really giving anything up there. You'd have to enlist the services of a knowledgeable machine shop that can do the calculations for determining how much to shave, to get you the compression ratio you need. This would seem to be the easiest route to a higher compression ratio.