Turbo Fox project...

coupe · 06-18-2008, 08:41 AM

I've had my block, crank, rods, pistons, etc. for a while now. They've been "aging" in a corner of the shop because of other priorities. I pruned a few "smacktalk" posts out of this thread (including mine), since everything keeps getting delayed. LOL.

Engine will be a 331 and includes the following parts:

4-bolt R302 block
4340 forged crank
H-beam rods
Ross Pistons

Engine management will be a FAST classic sequential box.

Team Z suspension going under it along with tubular K-member and coilovers.
I have full intentions of driving the car on the street, to work, track, etc...

EHardy1971 · 06-18-2008, 12:24 PM

I hear ya' Matt! I know the feeling,my coupe sat under the carport for 3 years with no engine/tranny in it while I built up my 306.Not having the free time to do it all at once can be frustrating!

coupe · 06-18-2008, 01:09 PM

Quote:

Originally Posted by EHardy1971

Not having the free time to do it all at once can be frustrating!

yep. I had some of the parts before Italian LX even ordered his 418 stuff.

coupe · 06-19-2008, 03:55 PM

You power-adder guys who've built your motors...what kind of piston clearance did you have in the bore?

I have my sights set on a figure, but I'm curious as to what you guys used. And what type piston and bore size for the given clearances.

BAD INT · 06-19-2008, 11:05 PM

Quote:

Originally Posted by coupe

You power-adder guys who've built your motors...what kind of piston clearance did you have in the bore?

I have my sights set on a figure, but I'm curious as to what you guys used. And what type piston and bore size for the given clearances.

what does your piston manufacturer recomend ? you just dont have a poll about that

coupe · 06-20-2008, 07:56 AM

Quote:

Originally Posted by BAD INT

what does your piston manufacturer recomend ? you just dont have a poll about that

No poll, just wondering what these other guys values are.

Must be a top-secret, seeing how they jumped in here with numbers.

Ross has a range of values for turbo and for street car. I'm setting mine up somewhere in the middle, to avoid a noisy cold-start. The 2618 alloy expands more than a 4032 or hypereutectic piston, so I still must give it some room. I concurred with Mark O' Neal. .0045 is my goal. +/- .0005

SkurdalenFox · 06-19-2008, 06:05 PM

Oddly enough, I was bored, and leafing through an engine building book. This is what the guy says in regards to forced induction piston clearance:

"I prefer to bore the cylinders to within .004" of the finished size, then hone each cylinder to fit a particular piston. In this way I can keep piston clearance to a tolerance of about .0003".
[...]
First using 220 grit stones, about .003" of material is removed to bring the bore to .001" from its final size. Then another .0005" is taken out with with 280 grit stones, and finally 400 grit stones are used to bring the bore to its final diameter. This result in a very accurate bore with a fine finish that requires very little break-in."

SlowJoe · 06-19-2008, 06:45 PM

give us some SPECS on the motor.

coupe · 06-19-2008, 07:00 PM

Quote:

Originally Posted by SkurdalenFox

...In this way I can keep piston clearance to a tolerance of about .0003".

Hmm..."Tolerance on a clearance"...probably along the bore. This must not be confused with a .0003 clearance alone between piston and cyl though! That would lock up in about two seconds.

Quote:

Originally Posted by joecoupe

specs on the motor

Well, it's a 331. Compression is a modest 8.5:1 but I don't plan on leaving it naturally aspirated... It'll be Supernaturally Aspirated.

SkurdalenFox · 06-19-2008, 07:10 PM

Quote:

Originally Posted by coupe

Hmm..."Tolerance on a clearance"...probably along the bore. This must not be confused with a .0003 clearance alone between piston and cyl though! That would lock up in about two seconds.

Yes, yes. I was going to say something about this guy's horrible writing.

Quote:

Originally Posted by coupe

Supernaturally Aspirated.

Get that trademarked.

06-18-2008, 08:41 AM	#1
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Turbo Fox project... I've had my block, crank, rods, pistons, etc. for a while now. They've been "aging" in a corner of the shop because of other priorities. I pruned a few "smacktalk" posts out of this thread (including mine), since everything keeps getting delayed. LOL. Engine will be a 331 and includes the following parts: 4-bolt R302 block 4340 forged crank H-beam rods Ross Pistons Engine management will be a FAST classic sequential box. Team Z suspension going under it along with tubular K-member and coilovers. I have full intentions of driving the car on the street, to work, track, etc... __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein Last edited by coupe; 10-05-2009 at 02:52 PM.

06-18-2008, 12:24 PM	#2
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	I hear ya' Matt! I know the feeling,my coupe sat under the carport for 3 years with no engine/tranny in it while I built up my 306.Not having the free time to do it all at once can be frustrating! __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

06-19-2008, 03:55 PM	#4
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	You power-adder guys who've built your motors...what kind of piston clearance did you have in the bore? I have my sights set on a figure, but I'm curious as to what you guys used. And what type piston and bore size for the given clearances. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

06-19-2008, 06:05 PM	#7
SkurdalenFox Senior Member Join Date: Sep 2005 Location: Boulder, CO Posts: 463	Oddly enough, I was bored, and leafing through an engine building book. This is what the guy says in regards to forced induction piston clearance: "I prefer to bore the cylinders to within .004" of the finished size, then hone each cylinder to fit a particular piston. In this way I can keep piston clearance to a tolerance of about .0003". [...] First using 220 grit stones, about .003" of material is removed to bring the bore to .001" from its final size. Then another .0005" is taken out with with 280 grit stones, and finally 400 grit stones are used to bring the bore to its final diameter. This result in a very accurate bore with a fine finish that requires very little break-in." __________________ Jim

06-19-2008, 06:45 PM	#8
SlowJoe Mind Blowing Join Date: Jun 2006 Location: Dawsonville Ga Posts: 3,913	give us some SPECS on the motor. __________________ Slow Joe Racing 2008 dodge ram 5.7 HEMI 1993 lx with a 289 and a 3 speed on the floor WTB 1955 t-bird project