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Old 10-19-2017, 10:52 AM
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.030 over 455 with a factory N crank, factory rods, Speed Pro/TRW forged pistons, as cast KRE D's, 10:1 compression ratio, rpm no more than 5500, E85 and a modest turbocharger.

When does it go boom?

I've long talked about turbocharging my firebird but I've always held off simply because of the rotating assembly in the engine.

A recent engine master's episode got me thinking about it as a thought experiment though. How much boost could you feasibly send through a combination like that and get it to live on the street?

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Old 10-19-2017, 12:21 PM
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5 Psi shifting at 5000 rpm you might get some time out of it, but it will be a time bomb . At least put some good rods in it... You'll have a better chance ...

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Old 10-19-2017, 02:06 PM
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I have 0.030" over 455 with a stock non-N crank and a set of worked cast rods... ARP bolts, shot peened, beams ground, and set up for full floating pins. no bushing on the small end. and a set of Ross pistons. This short block went 6.02 @ 120MPH to the 1/8th at about 2900 lbs. race weight. This short block saw over 20 psi with a 0.484" lift 230 at 0.050" duration cam and out of the box round port Edelbrocks. It is still running in a different car with D port heads and a S400 turbo now, but hasn't been run much.

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Old 10-19-2017, 04:23 PM
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Originally Posted by v869tr6 View Post
I have 0.030" over 455 with a stock non-N crank and a set of worked cast rods... ARP bolts, shot peened, beams ground, and set up for full floating pins. no bushing on the small end. and a set of Ross pistons. This short block went 6.02 @ 120MPH to the 1/8th at about 2900 lbs. race weight. This short block saw over 20 psi with a 0.484" lift 230 at 0.050" duration cam and out of the box round port Edelbrocks. It is still running in a different car with D port heads and a S400 turbo now, but hasn't been run much.
That's pretty impressive. More than 700 to the tires it would seem.

Close to what I've been able to gather when I had my 455 apart. At the very least it has a set of ARP rod bolts in it. I've never seen a true factory rod to compare so I can't tell if the rod's have been peened or not.

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Old 10-19-2017, 09:38 PM
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Agree with Charlie that these are somewhat of a 'Time Bomb"
Really more like a Hand Grenade, as long as you are careful you can play around a bit.

Light car, small camshaft duration and lift, rods at least checked for cracks, engine might live a while.

I had an engine like that one time, came out of an ambulance vehicle, fresh rebuild. Put a small 421 SD camshaft in it, headers, and just kept the rpm low, and beat the crap out of it for 4 years of college. Made a lot of noise, women were impressed.

But it could have failed the next day.

So really what are your GOALS with this boost build/

Tom V.

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Old 10-20-2017, 10:28 AM
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I'm too afraid of windowing a perfectly good block/engine to ever do that, but an honest 600hp to the tire with streetable manors would be the goal.

Realistically, I'd add a set of rods, soften up the chambers a bit and get a piston with a better ring pack in there.

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Old 10-20-2017, 01:05 PM
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A few things I believe to be true,
A 1/16" set of rings in most turbo engines are going to be just fine. The new short block I am building has 1/16th rings.
A turbo engine has to pump the cylinder empty due to back pressure, so it never sees the small end being pulled apart.
I have a friend who just went 135mph to the 1/8 mile with a 250,000 mile LS short block, stock pistons, rings, rods and crank. It does have new bearings and a turbo cam.
I would use better rods in a Pontiac build just for some insurance, and they wouldn't cost much compared to the turbo build.

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Old 10-20-2017, 01:15 PM
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Yeah I recall most of that from reading Corky Bell's book on maximum boost. The stresses comparatively to make the power he claims to be far less then doing it with RPM.

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Old 10-20-2017, 02:13 PM
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The higher you go with the boost level the higher the motor is going to want to spin. So you have to be careful ...

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Old 10-20-2017, 07:32 PM
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Corky Bell is a very nice Gentleman from Texas and he has written several very good books on Boosting: Supercharger and Turbocharger) that Ford has in their Ford Research Library. Also each "Boost" Engineer has a Personal Copy of his books.

Highly Recommended to purchase his books on Boosting.

He also has some outstanding Cores for Intercoolers for sale.

Tom V.

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Old 10-21-2017, 07:32 AM
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Quote:
Originally Posted by Tom Vaught View Post
Corky Bell is a very nice Gentleman from Texas and he has written several very good books on Boosting: Supercharger and Turbocharger) that Ford has in their Ford Research Library. Also each "Boost" Engineer has a Personal Copy of his books.

Highly Recommended to purchase his books on Boosting.

He also has some outstanding Cores for Intercoolers for sale.

Tom V.
do you have a link to look at his parts he sells Tom? I looked on line and came up with nothing...

Thanks

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Old 10-22-2017, 09:05 PM
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I have and reference Maximum Boost regularly. I wasn't aware he had other books on the subject, I'll have to look for those.

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Old 10-18-2019, 05:28 PM
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Quote:
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I have and reference Maximum Boost regularly. I wasn't aware he had other books on the subject, I'll have to look for those.
A Book on Turbochargers and their systems and a book on Superchargers and their systems and possibly a third book but I have not looked in quite a while.

Here you go:

https://bellintercoolers.com/p-36968-about.html

1-830-438-6150


Tom V.

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Last edited by Tom Vaught; 10-18-2019 at 05:35 PM.
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