J32A2 Engine + J35A3 Crank & rods > J35A3 Engine + J32A2 Cams?
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J32A2 Engine + J35A3 Crank & rods > J35A3 Engine + J32A2 Cams?
Is J32A2 Engine + J35A3 Crank & rods better than J35A3 Engine + J32A2 Cams?
Or would they be the same??
Or would they be the same??
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zeta (04-10-2018)
#3
Suzuka Master
iTrader: (1)
The post below is a source of good information that I always refer to when I 'get a hair' and think about going the J35A3 route.![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Maybe it will help you, cuz you know you want to do it!
![Thumbs Up](https://acurazine.com/forums/images/smilies/thumbsup.gif)
Difference between J32A2 and J35A3:
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Maybe it will help you, cuz you know you want to do it!
![rofl](https://acurazine.com/forums/images/smilies/rofl.gif)
![Big Grin](https://acurazine.com/forums/images/smilies/biggrin.gif)
![Thumbs Up](https://acurazine.com/forums/images/smilies/thumbsup.gif)
Difference between J32A2 and J35A3:
Both blocks are the same. The only difference in the oil pumps is the pressure valve and spring, the J32A2 parts can be purchased for around $20. The coolant crossover manifold is different but can be made to work. The EGR valves are different and must correspond to the appropriate ECU. Of course the crank, rods and pistons are different. J35A3 has forged crank and rods but they are not comparable to after market forged rods but still better than cast (J32A2 has forged crank only). The heads are the same castings and use the same valve seats even thought the J32 uses a 1mm larger intake vale (with a valve job the smaller valve will flow more, due to less shrouding). Lost motion assemblies were updated for the 03 J32. The cams and springs are different (J32 springs are considerably stronger). The intake of the J35 utilizes are 1" spacer between the upper and lower runners and the upper intake is the same between the two with the exception of the longer trumpets used on the J35 (produces more torque below peak). The TBs are the same with the exception of the MAP sensors and the corresponding MAP sensor must be used with the correct TB (both use the same plug).
If forced induction is in your future use the J35A3. Clean up the casting marks in the intake tract but do not increase the size and enjoy the lower static compression and cams with less over lap. (upgrade the oil pressure spring and valve for good measure)
For some NA fun on the cheap start with J35A3 use J32A2 cams and springs, port from the J35A3 IM to the valves, valve job and mill the head. (.010" is approximately equal to 0.25:1 static compression with J35 rotating assembly). I milled mine to 0.030" with no valve clearance issues and an estimated 10.75:1 static compression (no issues achieving correct mechanical timing with 0.030" milled). I also upgraded the oil pressure spring and valve in the bottom of the oil pump.
Assuming that even if you don't separate the heads and run the long block as is replacing all exterior seals and gaskets only makes good since. Since you have to pull the pan to replace the the gaskets behind the oil pump and pickup, removing one allen plug and dropping the J32A2 oil pressure spring and valve in place is some really cheap insurance.![2 Cents](https://acurazine.com/forums/images/smilies/2cents.gif)
If forced induction is in your future use the J35A3. Clean up the casting marks in the intake tract but do not increase the size and enjoy the lower static compression and cams with less over lap. (upgrade the oil pressure spring and valve for good measure)
For some NA fun on the cheap start with J35A3 use J32A2 cams and springs, port from the J35A3 IM to the valves, valve job and mill the head. (.010" is approximately equal to 0.25:1 static compression with J35 rotating assembly). I milled mine to 0.030" with no valve clearance issues and an estimated 10.75:1 static compression (no issues achieving correct mechanical timing with 0.030" milled). I also upgraded the oil pressure spring and valve in the bottom of the oil pump.
Assuming that even if you don't separate the heads and run the long block as is replacing all exterior seals and gaskets only makes good since. Since you have to pull the pan to replace the the gaskets behind the oil pump and pickup, removing one allen plug and dropping the J32A2 oil pressure spring and valve in place is some really cheap insurance.
![2 Cents](https://acurazine.com/forums/images/smilies/2cents.gif)
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teh CL (04-11-2018)
#5
Greetings comrades. Instead of creating a new thread, I hope nobody minds if I ask a question right here. I'm about to build a 3.5/3.2 hybrid (J32A2 block, pistons, heads, cams, J35A1 crankshaft and rods). It'll be run by my stock J32A2, and the question is - how does this affect gas mileage? I'm aware of someone running a J35A3 on a J32A2 ECU whose fuel consumption went up 25%. I'm assuming that it's due to the ECU and the cams being incompatible, but if anybody has some real experience - please share. Thank you.
#7
Suzuka Master
iTrader: (1)
InspireJ32A, what is the part # for the ECU in your car?
TL-S=37820-PGE-A62
TL-P=37820-PJE-L65
From what I understand the TL-S ECU has the more aggressive (higher performance) programing; therefore, it would compliment the better J32A2 Type-S cams and would not drastically influence MPG.
TL-S=37820-PGE-A62
TL-P=37820-PJE-L65
From what I understand the TL-S ECU has the more aggressive (higher performance) programing; therefore, it would compliment the better J32A2 Type-S cams and would not drastically influence MPG.
![Dunno](https://acurazine.com/forums/images/smilies/dunno.gif)
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Last edited by zeta; 03-16-2021 at 06:58 PM.
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