Originally Posted by fsttyms1

Air is the issue, id place money on it that there isnt enough getting in. Especially watching the live data while driving it as it hits those areas

Originally Posted by screaminz28

I don't think so. I think the J37 has a different bellhousing pattern, and depending on which J37, maybe not even manual compatible.

I suspect, and am looking for confirmation that the J35A6 and 7 from a 05 - 06 Odyssey will work with the 'old school' J30/J32 transmissions.

The a7 has piston oil squirters as well. There is rumor that they are FRM liners, but I really don't care about that. The CR is only 10:1 as well, but that is better for FI.

The part number is the same on the following blocks, except for the 3 letters which indicates what vehicle they came in first.

J32A1 - 1999 - 2003 TL
J32A1 - 2001 - 2003 CL
J35A1 - 2003 - 2004 PILOT
J35A1 - 1999 - 2004 ODYSSEY
J32A3 - 2004 - 2006 TL
J32A2 - 2002 - 2003 TL-S
J32A2 - 2001 - 2003 CL-S
J35A3 - 2001 - 2002 MDX
J35A6 - 2005 - PILOT
J35A6 - 2005 - 2006 ODYSSEY
J35A7 - 2005 - 2006 ODYSSEY EX-L
J30A1 - 1998 - 2002 ACCORD
J30A4 - 2003 - 2004 ACCORD
J30A5 - 2005 - 2007 ACCORD

While I guess techincally you could use any of these with your transmission, ideally, you'd want one of these engines that has the single port exhaust so you don't have to rethink the exhaust:

All of these use the same single port exhasust, and RV6 lists their PCDs as compatible:

TL 04-08
MDX 03-09
RL 05-08
Accord V6 03-07
Odyssey 05-10
Pilot 03-08
Ridgeline 06-08

So, no J37s in the mix. The Odyssey/Pilot is the 'best choice' I'd think for largest displacement and lower CR. From my investigation, they are a bit more expensive than a TL 3.2, but not that much, maybe a couple hundred bucks.

If you have some J37 heads, I guess you could rock a J35 shortblock and slap those heads on it. But I think it HAS to be the A6 and A7. The A4 has a different oil passage if I recall. I'll try and find that.

Originally Posted by simione

Oh, it definitely wouldn't hurt, but I'm sure a set of cams would help tremendously. Don't you have greddy exhaust?

Originally Posted by Accord325

Anyone with our vehicles (03-07 accord and 04-06 TL) and before the Bellhousing change, a J35a5 04-06 MDX) is probably the best straight swap. I believe the MDX have a stronger crank and rods then the odyssey, it definitely made more power stock.

By keepin the Bellhousing shape, 6-6 TL LSD is also more available for Accord guys

Originally Posted by GravyManager

Sorry if this is irrelevant for this thread, but there's some extremely bright minds in here that I joined this forum just to ask:

Would it theoretically be possible to build a "budget" high compression J30A by using OEM Honda k-series pistons, and J30A4 heads? I'm sure there's much more to it than just that, but I'm just curious if this is completely unfeasible, or if this "could" be done. I'm not after lots of torque, this would actually be a swap done for a Miata. I'm not too familiar with j-series stuff yet, but it seems possible? I'd even completely consider doing a J25 with OEM k-series pistons and J30A4 heads. Am I completely off base here? I think a high(er) revving j-series in a Miata would be completely perfect for the chassis.

Thanks in advance!

Originally Posted by Accord325

K Pistons are 89mm and the J30's are 86mm...so no, unless you spend a lot. You can bump compression a point by milling the heads .040". That or get after market High Compression pistons. Nothing about J series Engines are "Budget" minded. This is literally a "Pay to Play" game here. My suggestion, Boost or Nitrous. Have fun............

Originally Posted by GravyManager

Sorry if this is irrelevant for this thread, but there's some extremely bright minds in here that I joined this forum just to ask:

Would it theoretically be possible to build a "budget" high compression J30A by using OEM Honda k-series pistons, and J30A4 heads? I'm sure there's much more to it than just that, but I'm just curious if this is completely unfeasible, or if this "could" be done. I'm not after lots of torque, this would actually be a swap done for a Miata. I'm not too familiar with j-series stuff yet, but it seems possible? I'd even completely consider doing a J25 with OEM k-series pistons and J30A4 heads. Am I completely off base here? I think a high(er) revving j-series in a Miata would be completely perfect for the chassis.

Thanks in advance!

Originally Posted by GravyManager

Or better yet, everything I mentioned above, with the addition of aftermarket forged rods for a Ford modular 5.4 (used in a J25)? I'm no machinist, but I know a few engine builders from a previous job I worked that could probably do all the machining and assembling necessary for this combo. Anyone care to chime in? Seems like it would be a rock solid powerplant even when spun up to 8500rpm or so.

Originally Posted by yungone501

Being that the k-series uses the same 1.181" compression height, 22mm pin diameter, and 86mm bore, I'm not sure why it wouldn't be possible. And as you mentioned, the rods will require some machining to work. The rod width must be taken down a bit and oversized bearings would need to be used in the BE bore.

Originally Posted by UTAH TSX

Does anyone have a compression calculator and the specs for a J35a8 to figure out what compression ratio this piston would have (K24 with K20 head piston)
Wiseco piston # K568M89 89.00 bore 10.59 compression ratio with 50.5cc combustion chamber .025 gasket and 9.114 compression height

Originally Posted by yungone501

I've had several people here lately ask me about if using other 89mm pistons for the j32/j35 is possible and although a few of them (89mm pistons) are made, only the k20/k24 (+3mm) pistons match their specs.

A typical j32/j35 and k20/k24 (+3mm) piston uses the following specs:

Compression height (pin center to piston top)- 1.181" or 30mm
Pin diameter- .866" or 22mm
Bore diameter- 3.504" or 89mm

The thing to be careful of is that the stock k20/k24 piston uses an 86mm bore which is 3mm too small for the j32/j35 89mm cylinders. You MUST use the oversize pistons that are 89mm in diameter and are usually noted to have "+3mm". Do NOT try and use the H-series pistons, they have a different compression height. There are several piston manufacturers that make them such as Wiseco, CP, Ross, Arias, JE (and a few more) but to my knowledge Wiseco is the cheapest in regards to value. JE is considered by many to have the best quality and strength.

Here's a small list that I made with part numbers and compression ratios of k20/k24 89mm pistons from various manufacturers. One thing to remember is that the k20/k24 combustion chambers do not have the same volume as j-series heads so this means that any compression ratios given with pistons on manufacturers websites will NOT be accurate. For those who know how to use Google, search for "compression ratio calculator" and use the chamber size of 53.5cc's to determine the correct CR for what ever +/- volume the piston will possess.

Wiseco-

K634m89 +5 dome

K568m89 -9 dish

K573m89 +8 dome

K650m89 +10.5 dome

JE Pistons-

242869 8.2:1

309420 9.0:1

309423 10.0:1

309426 11.5:1

CP Pistons-

SC70453 9.0:1

Though it's clearly not a full inventory list, this will help some of you to have an idea of what to look for in the catalogs.

Some of you may be wondering why not just "do things right and order the correct CUSTOM pistons". Well, that's because most manufacturers charge a bit more for each piston and will also take them typically 3-5 weeks to manufacture them. Lastly, the last two sets of Wiseco pistons I've seen have the same part numbers as the k20/k24 pistons do right on the crown. The k-series pistons are tried and true for fitment.

Here's a few pics I took comparing the K568M89 Wiseco piston to the stock j35 piston from an 05 Odyssey.








And just to show off the beauty in machining & design...

Originally Posted by Euro-R_Spec_TSX

They would fit, but the compression ratio would be 12.2. A bit high for street driving. The J35 piston would be good. That would get you 11.3 compression. And they weigh less.

Originally Posted by UTAH TSX

JE pistons won't work you must have them custom made for the front bank this is what we did ------Well we got the 2 pistons to match the 4 we had and guess what they wont work the valve reliefs need to be the opposite on the front bank of pistons, the JE pistons are asymmetrical so we cannot flip the piston around


Is this in reference to the squirters on the j35a8 or clearance for the valves on the j35 block j32 head combo?

Originally Posted by Euphoric

The thrust side of the piston (big skirt is needs to be flipped for bank 4-5-6)
the valve reliefs are different size and the intake valves will hit the piston if put in backwards

Originally Posted by UTAH TSX

You're speaking about only the JE pistons here, correct?

Originally Posted by UTAH TSX

Well any piston that has valve reliefs that are not going to clear if turned backwards or if the skirts are different thrust and non thrust sides in other words it would have to be non directional piston

Originally Posted by yungone501

Jesus, I didn't even think of this.

I guess due to the fact I seen TonyTheTiger's build using the same Wiseco pistons shown in my first post, I neglected to invest anymore thought into this aspect of the matter. I need to get with Wiseco (or any other fore mentioned manufacturer) and see if theses features can be reversed or machined different during the manufacturing process to allow fitment/use of them for the j-series.

Thanks for the update Utah!

***Until then, can I get a mod to make some changes to the title/first post in regards to these pistons being a usable part in the j-series until further notice. If so, don't hesitate to contact me through PM for details. Thank you.***

Originally Posted by flexer

I don't understand. Why change the topic post? The k24/k20 head pistons do work off the shelf for the j series. The only ones that don't appear to be the JE pistons do to there skirt design correct?

Originally Posted by screaminz28

Do they work across ALL J series? J32s don't have piston oil squirters and I believe the Wisecos are short enough that even they work in the J35 with squirters.

Perhaps the JEs would work in a J32 without issue - granted they wouldn't have the custom reverse design with the thicker thrust side and what not.

Originally Posted by flexer

Gerzand said he is running the stocked shelf wisco's in his j35a8 no problem.