[DeadDoc]

possible to get a j35 block with j32 upper engine to a 10cr or lower? That will really make me think twice about my setup.

 

[Cocoa]

For the J35/J30 combo; although it states the disadvantage is the top end power, I was wondering if you LOSE power in the high end as appose to having a stock J30 engine.

 

[Cocoa]

Also, does the MDX (03'-04') block have the special cylinder walls like the J32A2 that dissipates heat better.

 

[CL SLeePeR]

J35A4/J32A2
advantage: great entire powerband and especially torque.
disadvantage:
With '03-04 Odyssey or '03-04 MDX block it is required to purchase 2005 Acura RL pistons (new set $50 each) This is a best option still since these pistons have clearance for large 36mm J32A2 (intake) valves thus no modification needed. Despite the fact they have higher 11.0:1 CR still even supercharger can be used here with low boost up to 7psi intercooled (assuming safe AFR).

So the 2005 RL pistons clear the j32A2 valves? Which rods should be used? Not to question you or anything.. but where are you getting your information from..? Just want to be certain, that's all..!

Looks like I will be stopping by Acura sometime this upcoming week...

 

[Cocoa]

Also, where do you get those pistons for 50 bucks a pop?

 

[Hunsvotti]

Got a ?

What does the letters/numbers AFTER the J30 or J32 or J35 mean?

ie:J30A1

J30A1
J = J-block V6
30 = 3.0 liters
A1 = What kind of heads it has

 

[DeadDoc]

J30A1
J = J-block V6
30 = 3.0 liters
A1 = What kind of heads it has

well it is a revision number like planes. Just something major enough was modified for a number change. ie heads, which might be the only thing!

Just wondering did the 97 v6 run a j30 as well?

 

[Cocoa]

MDX cylinder walls are thicker and better resist cracking from high thermal/pressure loads. They are marginally worse at dissipating temperature vs. the spin cast design of the J32A2 but in no case this should hinder the performance for both NA or FI vihicles well, unless extreme heat (non-intercooled) generated under boost over 6-7psi.

So would that be the case for those that use 125 shot of nitrous like myself?

 

[02AV6]

So the 2005 RL pistons clear the j32A2 valves? Which rods should be used? Not to question you or anything.. but where are you getting your information from..? Just want to be certain, that's all..!

Looks like I will be stopping by Acura sometime this upcoming week...

Yep, '05 RL pistons have 36mm valve pockets which are perfect fit for Type S large (intake) valves. I'm currently on vacation and will attach pics when come back (after 10th). As far as information I'm getting from friend of a friend who works at Acura part dept

This is what Acuranews says:

The forged crankshaft of the RL is similar to that of the MDX, but with revised counterweights to accommodate the weight of higher compression pistons. With their taller, reinforced crowns, these new pistons raise the compression ratio (relative to the MDX) from 10.0:1 to 11.0:1. The previous generation 3.5 RL had a compression ratio of 9.6:1. The elevated compression ratio is a key element in the horsepower gain compared to the previous generation engine. Part of the reason this elevated compression ratio is possible is an oil jet system that sprays cooling oil on the underside of the piston crowns to keep temperatures in check. New steel connecting rods are forged in one piece and then the crankshaft ends are broken , creating a lighter and stronger rod with a perfectly fitted bearing cap.

The best bet is to have '01 Odyssey block and swap in '05 RL pistons. Not sure about '01-02 MDX block this should be checked. '03-04 MDX crankshaft which is the same part as '05 RL will not work.
Bottom line, I checked crank, rods cannot be used from either '03-04 MDX or '05 RL on Odyssey block - they won't work. Only 'RL pistons/rings are good.

 

[02AV6]

So would that be the case for those that use 125 shot of nitrous like myself?

If you tune it right (safe AFR) you should be fine

 

[Cocoa]

Does anyone know where to get the J35A4 short block? I can't find it at any junk yards. They are selling it as a whole engine

 

[Plumaccordcoupe]

I love this thread, so much info

:up2: .

Just wondering did the 97 v6 run a j30 as well?

Nope, the 95-97 AV6 had a C27A4 (90 degree block, SOHC, no Vtec).

 

[Cocoa]

So do you lose power in the high end with the J35 block and the J30 head? As apposed to just having a stock J30 ?

 

[CL SLeePeR]

So do you lose power in the high end with the J35 block and the J30 head? As apposed to just having a stock J30 ?

As stated earlier in this thread...

Here are the swap options along with brief advantage(s)/disadvantage(s):
I will be going in details later J35A4/J32A2

BLOCK/HEADS (incl. manifold (upper/lower), tb)
------------------
J30A1/J30A1
advantage: no modification needed.
disadvantage: no torque until turbo/sc kicks in.

J30A1/J32A2
advantage: mid-range and top-end power
disadvantage: J30A1 pistons have to be modified to fit large J32A2 (intake) valves.
Not much torque until turbo/sc kicks in.

J32A2/J32A2
advantage: no modification needed, mid-range, top-end power.
disadvantage: torque is still ok but better than J30A1

J35A4/J30A1
advantage: no modifications needed, great torque, nice mid-range
disadvantage: top-end power

J35A4/J32A2
advantage: great entire powerband and especially torque.
disadvantage:
With '03-04 Odyssey or '03-04 MDX block it is required to purchase 2005 Acura RL pistons (new set $50 each) This is a best option still since these pistons have clearance for large 36mm J32A2 (intake) valves thus no modification needed. Despite the fact they have higher 11.0:1 CR still even supercharger can be used here with low boost up to 7psi intercooled (assuming safe AFR).

 

[CL SLeePeR]

This is what Acuranews says:

The forged crankshaft of the RL is similar to that of the MDX, but with revised counterweights to accommodate the weight of higher compression pistons. With their taller, reinforced crowns, these new pistons raise the compression ratio (relative to the MDX) from 10.0:1 to 11.0:1. The previous generation 3.5 RL had a compression ratio of 9.6:1. The elevated compression ratio is a key element in the horsepower gain compared to the previous generation engine. Part of the reason this elevated compression ratio is possible is an oil jet system that sprays cooling oil on the underside of the piston crowns to keep temperatures in check. New steel connecting rods are forged in one piece and then the crankshaft ends are broken , creating a lighter and stronger rod with a perfectly fitted bearing cap.

Could one get the same oil cooling effects with the 03-04 MdX Block? Or is this a completely new oil port design for the new RL only?

 

[accordheat]

So do you lose power in the high end with the J35 block and the J30 head? As apposed to just having a stock J30 ?

i geuss its just a question of how much high end power lost though. if not much, it shouldnt be a huge problem. low RPM power is what would be best for us anyways, for me, when i drag race, id love to have more low and mid RPM power!

 

[02AV6]

Ok, I'm back with visual proof and answers to your above questions

Here is the pic showing J32A2 (CL-S/TL-S) intake/exhaust valves difference.
The largest is the intake valve measured at 36mm vs 30mm exhaust.

And here is the pic showing the difference between 3.5 pistons

Left to right:
'05 Acura RL, '02-04 Honda Odyssey, 03-04 Acura MDX

Piston Part#
13010-RJA-000, 2005 RL, $50.47, 36mm/30mm (intake/exhaust valves)
13010-PGK-A01, 2002-2004 Odyssey, $29.89, 30mm/30mm
and Accord V6 valves are 30mm/30mm.

And since MDX piston is exactly the same as Odyssey, let's stick to Odyssey.

This is the documented proof showing '05 RL pistons are perfect fit for large CL-S/TL-S 36mm intake valves when installing 3.2L heads on 3.5L block whereas '02-04 Odyssey pistons required metal removal to increase valve pockets to fit.
Let's just stick to Odyssey

BTW, $50 each '05 RL piston set can be purchased from acuraautomotiveparts.org

So those who want J32A2 (CL-S/TL-S) heads on J35A1 ('01 Odyssey) complete block the best bet is '05 RL pistons otherwise get '02-'04 Odyssey pistons and have machine shop to clear the valve "pockets"

Or another option is '01-03 J32A2 (CL-S/TL-S) heads on '01-03 J32A2 (CL-S/TL-S)block. But you need Odyssey '01-03 crankshaft and rods as indicated on the page 1 (see J35A1/J32A2 listing) + '05 RL pistons

Or those who want to swap just 3.5 block can use stock 3.0 heads but at power loss up top:

I ran 270+WHP when I had the SC and the stock J30 with 8.5psi

I then put in the 01 ody engine intack and slapped in the SC and ran the same peak 270+WHP with 5.5. Gained incredible amount of torque. The high rpm band looked like it could do better so I determined to change the cams.

I got a set of type-s heads and put that in instead. I dyno'd and now the upper power band was clearly better. I just made a few runs to check if the heads made a difference and to check A/F. I ran 308s consistanly now ...

 

[alt04]

WOW! First ever visual documented proof from the history of V6P :up: regarding 3.5L swap with valuable info. Man, you should be on V6P salary 'cause you just save tons of money to others to find that out :up2:

 

[02AV6]

I should be on members salary since I saved them money to buy pistons to compare.

 

[Cocoa]

The 01-02 Odyssey Block should have no problem fitting the 05' RL pistons with the J32A2 head on it correct? I just purchased the 01-02 Odyssey block from RDX and the head from Aidan. My next step was the RL pistons if they drop in perfectly like they do on the MDX blocks.