Chevelle upgrades.

rfletes79

Active member
Mar 5, 2010
618
87
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Galt, Ca 95632
Cylinder cleaned up well, new piston with rings and pin. New SoCal rod. Checked the mains and rod bearings, they all look new so rolling with it.

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kidturbo

Piston Tester
Jul 20, 2010
1,653
347
83
Somewhere On The Ohio
www.marinemods.us
Hope ya don't experience what I did with race cast pistons.

Took a used set that had about 20hrs at 800hp in a boat when one cracked. Put that set, along with one new in a 500hp boat engine, only made it about 10hrs, she cracked another.. Scrapped the whole set and went ovals since it was my warranty work to eat then.

That set was suppose to be shipped back to Fingers to examine the pin area on the remaining 6 for anything of value.



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ikeG

Oughta Know Better
Apr 19, 2011
2,331
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Western PA
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The last 3 sets I've used have all had 1 crack. 1 set in a ~400rwhp hotshot dually, and 2 sets in 1000 rwhp trucks. It almost seems like they have had a quality issue or design change in the last 5 years. All the sets I've used or been a part of years ago(like 8 to 10) are still going strong.

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rfletes79

Active member
Mar 5, 2010
618
87
28
Galt, Ca 95632
Time will tell, it’s back together and driving down the road. We test here next week to ensure everything is still where it was and get ready for sick week in February.

I’m being hopeful but do realize I’m on borrowed time and better parts are out there. Rolling the dice and gonna start planning the new build. This one still has stock crank, main caps and bone stock cali heads.

Gonna turn the power down some and rely on short track, need to get that more consistent and faster. Also going to move the nitrous nozzles further away from the intake in hopes of spreading the mixture better prior to hitting the intake floor and slow the flow down some. Nozzles are currently 6-8 inches now from the intake floor. Going to move them as far as possible and pre IC, will be over 2’ away once this is done. And also continue limiting the shot. Was on a 800 hit 1 to many times

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DAVe3283

Heavy & Slow
Sep 3, 2009
3,514
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Boise, ID, USA
The downside of moving them pre IC is you lose a lot of efficiency in the IC. The hotter the charge entering the IC is, the more efficient it is.

For the coldest charge air temp, you need the nitrous after the IC, even if only just.

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KyleC4

Tech
Dec 30, 2016
470
48
28
Bay Area
Did you see something in your tear down that showed or looked like you were not getting even distribution to all the cylinders ? or is it more of a theory test and just see what happens ?

Keep it up. Seeing your Chevelle makes me want to stop with the side work and get going on mine
 

rfletes79

Active member
Mar 5, 2010
618
87
28
Galt, Ca 95632
A little of both. This is the 2nd #4 piston I’ve lost since going to this intake. I’ve heard of others out there with the issue, number 3&4 pistons.

Those 2 holes seem like the straightest shot from the IC plumbing to the cylinders, so it possible based on how fast the air is moving it goes to those holes more then the others.

Just a thought. I also realize I’m way past what’s recommended for power with this combo, so there’s that too….


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kidturbo

Piston Tester
Jul 20, 2010
1,653
347
83
Somewhere On The Ohio
www.marinemods.us
I've never actually sprayed a diesel personally. However back in the 90s, I sprayed a hundred different gassers. NOS dealer for a decade, and beta tested the first progressive controller unit to hit the market.

My specialty was extremely well hidden street systems. Like direct port under the intake, 20# bottle in spare tire hole. Purge into the exhaust.

But those sneaky Pete on steroids style setups usually suffered failures due to trash in a fuel jet. Is hard to explain a hole in top of a piston, when your naturally asperated... lol fun times.

What I learned that's actually transferable to this discussion, direct port as close to the valve as you can get is your sweet spot. Equal distribution is key. Even in a diesel, pistons don't like a blow touch on em while their neighbor is a richer mixture. They all prefer to all be fueled and cooled equally.

I finally outgrew the low power plates and under intake stuff and went full stackded proshot foggers, on a tunnel ram with efi. Piston holes went away, even with 400-600hp shots. So maybe look at stacking some jetted nozzles shooting right down the pipes.. I do appreciate ghetto fogging for its simplicity.. lol


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rfletes79

Active member
Mar 5, 2010
618
87
28
Galt, Ca 95632
I've never actually sprayed a diesel personally. However back in the 90s, I sprayed a hundred different gassers. NOS dealer for a decade, and beta tested the first progressive controller unit to hit the market.

My specialty was extremely well hidden street systems. Like direct port under the intake, 20# bottle in spare tire hole. Purge into the exhaust.

But those sneaky Pete on steroids style setups usually suffered failures due to trash in a fuel jet. Is hard to explain a hole in top of a piston, when your naturally asperated... lol fun times.

What I learned that's actually transferable to this discussion, direct port as close to the valve as you can get is your sweet spot. Equal distribution is key. Even in a diesel, pistons don't like a blow touch on em while their neighbor is a richer mixture. They all prefer to all be fueled and cooled equally.

I finally outgrew the low power plates and under intake stuff and went full stackded proshot foggers, on a tunnel ram with efi. Piston holes went away, even with 400-600hp shots. So maybe look at stacking some jetted nozzles shooting right down the pipes.. I do appreciate ghetto fogging for its simplicity.. lol


Bests

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This is for sure the answer. I just need time and planning with the right parts to make it happen.


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