slprwgn04

I know there are some gods when it comes to the j series and I could use them to point me in the right way...

not looking for hand outs if the info is out there, I have searched but am not coming up with much.

I am going to be stroking the j32a3 with mdx 3.7 crank and rods and rl pistons. I have seen that people say the RL pistons raise compression but everywhere i see that is on the a2 motors. Is it the same for the a3 that it raises the compression, im not sure of combustion chamber size differences.

Also with the RL pistons will there be any clearance issues on the a3 motor, once again most threads i see are done with the a2 motor or heads. I am wanting to have a final compression of around 12:1 and need to know what the RL pistons raise compression to so i can see if i need to mill head or anything which will lead to clearance issues if done wrong.

Once again if there is a thread with this information listed please point me in the right way and I will read myself. Thanks

yungone501

iTrader: (4)

As far as oem pistons go, the 2014 RLX pistons can get you 11.5:1 and is currently the highest CR you can obtain using factory parts. They're fairly cheap at around $65 and are also forged and are made using a high silicone content for greater heat resistance. The skirts are coated for reduced friction. ALSO, they are domed. Have a lowered ring landing for top ring protection (heat, knock, detonation).

The combustion chambers measure 53.5cc.

As for clearance issues using RL pistons in a a3 block, nope.

You should also consider the 3.6 which is basically using a j37 crank/rods, in a j32/35 block with 3.5 pistons.

slprwgn04

I am doing the 3.7 crank and rods... Was planning on doing the RL pistons since they are drop in and I don't have to change bore.. Are the RLX pistons same bore as the a3 block... If so that is looking to be a better option to up compression?

yungone501

iTrader: (4)

Lmao, not sure why I didn't catch onto you doing 3.6 but anywho...

Yes, the RLX pistons are 89mm. They will accommodate nicely. I'd be careful going any higher than what Acura does. Otherwise, you will have to do things to offset knock and detonation. Having to run high octane fuel or anything else extreme on a daily driver can be cumbersome just to squeeze a few more ponies out of an engine. If you're running NA on this, use a great set of cams and large displacement heads (preferable 3.7) to add power. High CR's are better left for track cars. Ones that have a justifiable purpose for needing to run high octane fuels.

yungone501

iTrader: (4)

Forgot I had taken these a few weeks ago...

slprwgn04

This is not going to be a daily... Actually wi be dropping this into a civic for a crazy sleeper! So fuel is not a crazy worry to me... I am going to port the stock a3 heads and for starters either run tl or RL cams... Was reading on one of the other forums that the RL cams, I forget what years... Supposedly they were little more aggressive but I need to look into that more as I have not seen duration numbers between the two

slprwgn04

Also, you said 11.5:1... Is that the a3 motor with the RLX pistons or is that what the RLX motor is??

yungone501

iTrader: (4)

05-08 RL is what you want.

Every j-series engine that I've ever checked measured out to be 53.5cc in the chambers. That being said, I can only assume that the RLX engine is the same. They do run a brand new head casting though and also run direct port injection so there's a chance the chambers volume is different from the others. The cheapest way to check this would be by checking dome volume on the RLX piston with another j-series piston that was pulled from the engine you will be using and take the difference between the two to create a formula to check the CR.

slprwgn04

Thanks... All this is getting me more excited for getting this started...

NvrDwn

J36 in a civic? You must make a build thread here. You have NO choice on the matter.

If your going this far out why not get better flowing heads and have them ported? You can always sell your a3 heads to make up for some of the loss. Also I'd look into Paul's dual throttle body setup, this bad boy will need to breath a lot.

slprwgn04

I have plans for a build thread once I get fully into the motor tear down and build... As for different head I have looked into it but with me porting the stocks I think flow will be enough, if I don't make max power then so be it, it's a civic that weighs nothing lol. I also like the idea of a straight a3 motor cause it seems everyone shys away from them a bit so I want to see what the motor is capable of...

I will certainly be getting in touch with Paul at some point to look into a couple things... I still have to figure out tuning and which route to go with it.

unknownsTL

Anyone know how I can get ahold of paul, my understanding is hes the man 2 stroke my 04 tl. I have quite the project here. I will b making a thread on this when I source all the parts. Please pm me with his contact info

thisaznboi88

iTrader: (7)

Clear your inbox. I sent you his sn. He doesn't give out his phone or email publicly

slprwgn04

Well plans changed, life happened, stuff got sold... But I am back at it again... Things have changed a bit and I think I will be using a j35 block and heads from an odyssey... Does anyone have an opinion on this over a j32a2 motor... I feel the 35 will give me more torque with the same hp as the a2 motor or is my thinking incorrect??

jiga21

Can rlx piston be used in j30a4 ? Im in the market for high cr pistons, and wasnt aware oem came with that high

Euro-R_Spec_TSX

The RLX engine has an 89.7mm bore, so the pistons are not "drop-in" replacements in a J32 or J35 block.