Wrist Pin height?
04-10-2011, 09:11 PM
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Wrist Pin height? I was shotting the breeze at the local tuner last week and I mentioned I was thinking about a 408 for a winter build. He mentioned that a 390 would be a better idea because of the wrist pin height on a 408. (Yes, he said 390. I've never heard of it.)
Someone inform me of what he may be referring to on these two different builds? He said something about how the wrist pin is too high on the 408 pistons.
Someone inform me of what he may be referring to on these two different builds? He said something about how the wrist pin is too high on the 408 pistons.
04-10-2011, 10:03 PM
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^ Tach better/ higher w the shorter crank?? I could do some 59 or 61cc heads for an n/a build and maybe get a set of 72's for boost to drop it down, right? Depending on valve relief size. Should be a stout platform for boost then.
I'd like to use my 243 heads on it for NA and eventually when I get the money for boost, I'll pick up some larger cc heads for it. I'd like to stay cathedral on them so I can still use my 102 on it.
I'd like to use my 243 heads on it for NA and eventually when I get the money for boost, I'll pick up some larger cc heads for it. I'd like to stay cathedral on them so I can still use my 102 on it.
Last edited by bayer-z28; 04-10-2011 at 10:09 PM.
04-10-2011, 11:46 PM
#6
^ Tach better/ higher w the shorter crank?? I could do some 59 or 61cc heads for an n/a build and maybe get a set of 72's for boost to drop it down, right? Depending on valve relief size. Should be a stout platform for boost then.
I'd like to use my 243 heads on it for NA and eventually when I get the money for boost, I'll pick up some larger cc heads for it. I'd like to stay cathedral on them so I can still use my 102 on it.
I'd like to use my 243 heads on it for NA and eventually when I get the money for boost, I'll pick up some larger cc heads for it. I'd like to stay cathedral on them so I can still use my 102 on it.
04-11-2011, 12:02 AM
#7
We're able to have much thicker ring lands with 3.800" crankshaft, we debur the bottom of the bores however 3.800/3.825 will clear with no clearacing using compstar H beam rods.
I've seen plenty of 408 pistons tweek the top ring land with boost. I've had one customer replace his 408 with 390 using a PT88, made more power. I'm not advocating the power gain, it definatly didn't loose power.
I have a line of exclusive pistons made by CP-Carrillo, 1.200" compression height.
I've seen plenty of 408 pistons tweek the top ring land with boost. I've had one customer replace his 408 with 390 using a PT88, made more power. I'm not advocating the power gain, it definatly didn't loose power.
I have a line of exclusive pistons made by CP-Carrillo, 1.200" compression height.
Last edited by AES Racing; 04-13-2011 at 01:15 AM.
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04-11-2011, 07:53 AM
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^ That's what I was wondering. I thought I remembered hearing him say something abotu the rings. But it was so out of left field that I didn't remember it easily.
04-11-2011, 04:34 PM
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^ I dunno about him, but I was thinking of 650rw for a goal. There's gonna be a track close to where I'm moving, so I may end up with a drag car. 
04-11-2011, 04:35 PM
#11
Around 1200hp (engine),
408 I believe combination was making 990rwhp @19psi
with 390 same combination made 1050rwhp @17psi
https://ls1tech.com/forums/forced-in...ugh-4l80e.html
408 I believe combination was making 990rwhp @19psi
with 390 same combination made 1050rwhp @17psi
https://ls1tech.com/forums/forced-in...ugh-4l80e.html
Reeeaalllllly!! VERY interesting!!
04-11-2011, 10:15 PM
#13
Around 1200hp (engine),
408 I believe combination was making 990rwhp @19psi
with 390 same combination made 1050rwhp @17psi
https://ls1tech.com/forums/forced-in...ugh-4l80e.html
408 I believe combination was making 990rwhp @19psi
with 390 same combination made 1050rwhp @17psi
https://ls1tech.com/forums/forced-in...ugh-4l80e.html
04-12-2011, 09:17 AM
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I was looking at an LME 408 a couple years ago, but found the finished cost to be WAY out of my range. The long block was reasonably priced, but add in everything else needed also. (fuel system, turbo(s), tune, induction, rear end etc etc)
04-12-2011, 06:34 PM
#17
FormerVendor
I have seen pistons "tweaked" a lot even on stock stroke deals so no special piston can save an engine or the pistons themselves from the tuner! Still I do like the lower stroke taller piston turbo / blower only deal AES is doing.
We used to do a lot of 3.900 strokes for the same reason but there's not a lot of pistons available except customs. This deal from AES is nice as they already have the right pistons there sitting on the shelf.
We used to do a lot of 3.900 strokes for the same reason but there's not a lot of pistons available except customs. This deal from AES is nice as they already have the right pistons there sitting on the shelf.
04-13-2011, 03:14 PM
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I have seen pistons "tweaked" a lot even on stock stroke deals so no special piston can save an engine or the pistons themselves from the tuner! Still I do like the lower stroke taller piston turbo / blower only deal AES is doing.
We used to do a lot of 3.900 strokes for the same reason but there's not a lot of pistons available except customs. This deal from AES is nice as they already have the right pistons there sitting on the shelf.
We used to do a lot of 3.900 strokes for the same reason but there's not a lot of pistons available except customs. This deal from AES is nice as they already have the right pistons there sitting on the shelf.
04-13-2011, 06:30 PM
#19
FormerVendor
There's some extra safety margin in the taller pistons like AES has here but for most apps the Wiseco shelf stuff works great for us.
Something extremely wacky crazy big hp I certainly don't ever mind more CH though of course!
04-23-2011, 08:50 PM
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^^ I'm gonna bump this as I have another question.. Are there any pistons that would be as good with a 4.125" stroke? (as the 3.900" stroke ones in question)
I've got a thing for a perfect square, if I can get it I'd be happy, but if there are other factors at play, I won't worry about it.
I've got a thing for a perfect square, if I can get it I'd be happy, but if there are other factors at play, I won't worry about it.