Mild 383 build

-
Bewy said:
273,
This is for you. I know from your posts that you are quite knowledgeable. Not wasting time with Turk, he doesn't know how an air bleed works.
Click to expand...
Last one, I don't agree with you and you don't seem like your gonna agree with us, lets just focus on the OP build, he's not stroking it anyways.
Bewy said:
You are confusing force with pressure [ loading ]. Look at the formula in post #112. Pressure= force divided by area [ not multiplied ].
In post #91, you said energy can neither be created or destroyed. 100% correct
In post #114, you used an example of 1000 lbs of force in the com chamber. Let's work with that.
Click to expand...
Combustion creates pressure, psi, my eg.. Was a 1000 psi (the psi of a average engine, full throttle) not a 1000 lbs of force, so the force from the piston would be F = P x A, larger piston more area for pressure to be applied = greater force to the rod.
 
Last edited:
Bewy said:
RRR,
Post #113, you disappoint me; I thought you were smarter than that. Look at the formula in post #112: Pressure= force divided by area. The force is the force of the expanding gas. The area is the piston area. If the area gets bigger [ a bigger diameter piston ], then the pressure gets less. [ the pressure being pounds per sq inch or whatever medium you are using for measurement.
I will be giving yet another example later using real numbers after I pick up my grandson.
Click to expand...


Don’t let that prick bully you into thinking you got it wrong.

You don’t. I posted the formula for power and the guy just doesn’t get it.

In fact, he says he has the Bettes book. If he does, he should read it because he knows a bigger piston makes more power because AREA matters.

It’s sad really how bull headed the guy is.
 
Alright gentlemen, let's not get a pissin match started here. Okay! This is my thread and all I'm askin is guidance.

I called Jegs today and had a nice little chat with the tech department. 10+-1/ 11-1 compression ratio with the pistons I got now!!!!! Gentlemen. I never in my life ever expected that and that's @ .600 lift!!!!!!! I'm ordering the heads tomorrow. Now!!!!!!! I. Do not. Want a super frumpy . Hard to get to idle camshaft.
 
fishmens67 said:
If you get the stealth, I'm sure Brandon can fix you up, he's a good guy.
I think for the price I'd go with the E-street 75.cc chamber, boost compression and capable of good quench with a flat top close to the deck.
They all flow about the same with the exception being the Trick Flo.
Click to expand...
Brandon? I got a g'son named Brandon. He ain't touchin nuttin!!!!!!!!!So whose doing the blending?
 
Shorty Thompson said:
Alright gentlemen, let's not get a pissin match started here. Okay! This is my thread and all I'm askin is guidance.
Click to expand...
Sorry, about the side quests, some like to try to pick apart what I say, fair enough but your right back to the main mission.
Shorty Thompson said:
I called Jegs today and had a nice little chat with the tech department. 10+-1/ 11-1 compression ratio with the pistons I got now!!!!! Gentlemen. I never in my life ever expected that and that's @ .600 lift!!!!!!! I'm ordering the heads tomorrow. Now!!!!!!! I. Do not. Want a super frumpy . Hard to get to idle camshaft.
Click to expand...
Stealth heads or ?
 
273 said:
Sorry, about the side quests, some like to try to pick apart what I say, fair enough but your right back to the main mission.

Stealth heads or ?
Click to expand...
Yes, Jegs Stealth heads. Absolutely blew my mind. He suggested a .050 head gasket as well. Just blows my mind.
 
Shorty Thompson said:
Yes, Jegs Stealth heads. Absolutely blew my mind. He suggested a .050 head gasket as well. Just blows my mind.
Click to expand...
If your going with piston zero decked most go .040" gasket for quench, I don't know if that's will give too much CR, maybe that's why the .050" suggestion.
 
273 said:
If your going with piston zero decked most go .040" gasket for quench, I don't know if that's will give too much CR, maybe that's why the .050" suggestion.
Click to expand...
273, he said he grabbed his calculation charts and calculated 10.5-1 up to 11.0 to 1 with the pistons I plan on using. No zero decking mentioned. That blew my mind. Literally. Was not expecting that at all.
 
Shorty Thompson said:
273, he said he grabbed his calculation charts and calculated 10.5-1 up to 11.0 to 1 with the pistons I plan on using. No zero decking mentioned. That blew my mind. Literally. Was not expecting that at all.
Click to expand...
I think he needs a new calculator, he's about a point and a half high. and no way with a .050 gasket, maybe a shim gasket.
Those pistons will fall in bellow deck.
 
Shorty Thompson said:
273, he said he grabbed his calculation charts and calculated 10.5-1 up to 11.0 to 1 with the pistons I plan on using. No zero decking mentioned. That blew my mind. Literally. Was not expecting that at all.
Click to expand...
I wish you'd lay out all the specs here so we could see what the compression will end up. I don't think I would trust them at Jegs to make that call.
 
Shorty Thompson said:
Yes, Jegs Stealth heads
Click to expand...
Why would you order Stealth heads from Jegs.
The Stealth head is Brandon's baby, he is the owner of 440 Source. He can give more incite on the head as well he has a shop that works with him.
BTW the Stealth head is closer to 82 cc chamber rather than advertised 80 cc.
 
fishmens67 said:
Why would you order Stealth heads from Jegs.
The Stealth head is Brandon's baby, he is the owner of 440 Source. He can give more incite on the head as well he has a shop that works with him.
BTW the Stealth head is closer to 82 cc chamber rather than advertised 80 cc.
Click to expand...
Since when does anybody follow good advice around here?
 
RustyRatRod said:
I wish you'd lay out all the specs here so we could see what the compression will end up. I don't think I would trust them at Jegs to make that call.
Click to expand...
What specs do you want? 1969 383, punched .070, pistons Silvo-lites 1276's @ from what I'm told CR is suppose to be around 8.5, from what I just looked up it's 8.0. Now mind you that's with a 440 block. I'm not using a 440 block however. I'm using a Lo-block 383 with stock 383 crankshaft. I'm taking the advice from here and getting the Jegs Stealth heads. I have no intentions of " zero decking " the block. Now the Tech there stated that I could go as high/big as .600" lift cam and be safe, ( no intentions of doing that), so my compression rate should / could be as high as 11.0-1. Minimum of 10.5-1. That's as far as I've gotten so far. Did that help you any? It's as much that I can divulge.
 
Shorty Thompson said:
What specs do you want? 1969 383, punched .070, pistons Silvo-lites 1276's @ from what I'm told CR is suppose to be around 8.5, from what I just looked up it's 8.0. Now mind you that's with a 440 block. I'm not using a 440 block however. I'm using a Lo-block 383 with stock 383 crankshaft. I'm taking the advice from here and getting the Jegs Stealth heads. I have no intentions of " zero decking " the block. Now the Tech there stated that I could go as high/big as .600" lift cam and be safe, ( no intentions of doing that), so my compression rate should / could be as high as 11.0-1. Minimum of 10.5-1. That's as far as I've gotten so far. Did that help you any? It's as much that I can divulge.
Click to expand...

Are you putting a 440 crank in this? You won’t have the compression you want. The pistons will be down in the hole.
 
Shorty Thompson said:
What specs do you want? 1969 383, punched .070, pistons Silvo-lites 1276's @ from what I'm told CR is suppose to be around 8.5, from what I just looked up it's 8.0. Now mind you that's with a 440 block. I'm not using a 440 block however. I'm using a Lo-block 383 with stock 383 crankshaft. I'm taking the advice from here and getting the Jegs Stealth heads. I have no intentions of " zero decking " the block. Now the Tech there stated that I could go as high/big as .600" lift cam and be safe, ( no intentions of doing that), so my compression rate should / could be as high as 11.0-1. Minimum of 10.5-1. That's as far as I've gotten so far. Did that help you any? It's as much that I can divulge.
Click to expand...
All of it to figure compression. Deck clearance, piston head cc, chamber cc and which gasket you plan to use. If you don't know deck clearance, piston compression height and piston head cc will do, along with head cc.
 
Shorty Thompson said:
Me. I do since I figure you can be trusted not to lead me astray. Either your credible, or , your not. Which is it?
Click to expand...
All good info in this thread, but for an additional $150 an hour I'll give you all the advise you need.
 
is my math not mathing? the silvo piston is even shorter than the stock piston, so it should be in the hole even more, no?

also, i wouldn't be on the horn with anybody but 440 source about their heads, and i would gladly pay their ask on them to support their business and the technical help i would or could need.
 
Using the united engine calculator, I get 9.5 static compression. That piston site .023 in the hole with a 383 crank and rod, zero for piston head cc since it has no valve reliefs. I used .039" for gasket compressed thickness and 4.3 for gasket bore size, so I'm probably "right close".
 
You must log in or register to reply here.
-

Back
Top