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Spartan GL's Build Thread: (09-21-14) New photos!



Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

crazyguy03 said:
I look for that same quality in my women. Just saying ;)
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rofllmfao

but the Block just got dropped off at the machine shop, owner of the machine shop was rather impressed with the project thus far and all the parts said i did great getting everything together (he is used to waiting on parts to arrive)

and car is currently at the paintshop
 
Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

So what do you guys think the max boost i can run with this setup could be? wanted to guess about 13-14* safely

machine shop asked.
 
Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

its an M90.

What CR pistons did you buy?

I'm curious why they want to know.

Nothing I've seen suggests the boost level would change the tolerances required for the motor.

Being boosted requires larger ring gap, and forged pistons requires larger ring gap.
 


Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

CR is a significant factor in how much boost you can run, but so is your dynamic compression ratio.

So your cam (which has no known specs thus its impossible to calculate DCR), bore, stroke, rod length all help determine DCR.

Simple way of looking at it is, cam lowers it, boost raises it.

So look at what boost levels others running the XPZ use.

Al heads wont matter in this equation because any increased compression you can run will already be imposed by their smaller combustion chamber.

Might want to consider having an experienced machinist work your heads over a little, IIRC there is still room for improvement.


As for timing, you need your peak pressure at a certain point.

IIRC, you typically want 14-16 ATDC for most motors. Unsure on value for our motors.

That depends on your combustion chamber design and a few other details.

AFR and timing are closely related though.

Richer you run, slower fuel burns, more timing you need to achieve same peak pressure point.
 


Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

matt5112 said:
CR is a significant factor in how much boost you can run, but so is your dynamic compression ratio.

So your cam (which has no known specs thus its impossible to calculate DCR), bore, stroke, rod length all help determine DCR.

Simple way of looking at it is, cam lowers it, boost raises it.

So look at what boost levels others running the XPZ use.

Al heads wont matter in this equation because any increased compression you can run will already be imposed by their smaller combustion chamber.

Might want to consider having an experienced machinist work your heads over a little, IIRC there is still room for improvement.


As for timing, you need your peak pressure at a certain point.

IIRC, you typically want 14-16 ATDC for most motors. Unsure on value for our motors.

That depends on your combustion chamber design and a few other details.

AFR and timing are closely related though.

Richer you run, slower fuel burns, more timing you need to achieve same peak pressure point.
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i have one the best machine shop on the east coast building my bottom end.

Godwin Singer Machine shop in St peters burg Florida, they have been around since 1940.. i am in great hands
 
Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

Spartan GL said:
i have one the best machine shop on the east coast building my bottom end.

Godwin Singer Machine shop in St peters burg Florida, they have been around since 1940.. i am in great hands
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Too bad your wallet isnt. Seriously not trying to hate. I can appreciate all the work going into the car but others have made 500 plus on stock bottom ends on turbo engines and your going SC route doubt youll make any kind of HP like that.
Hope you crack 400 whp.
 
Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

I personally really enjoy watching all the work you put into your car. New JE pistons and what not, people saying your wasting your money, but its your choice and your money. Your doing one hell of a build, and we can all agree on that. Its your money and not ours :) Id go the supercharged route over a turbo personally just because i love to hear the supercharger scream, even if i dont get as much power from it. just my opinion. Your car will be plenty quick when the build is done. Keep up the good work
 
X2. Do what U want. People hating cause they didn't have the money to spend on building a bottom end. If they did have the money, don't ya think they would have of?
You did it right and will officially have a complete built motor. Not just half built like most people do.

Props to your build!
 
No offense to Joe, but if I got shipped off to Iraq and got that extra bonus check I'd be spending it to, on other parts though.
 


Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

98GrandPrixIraqVet said:
Too bad your wallet isnt. Seriously not trying to hate. I can appreciate all the work going into the car but others have made 500 plus on stock bottom ends on turbo engines and your going SC route doubt youll make any kind of HP like that.
Hope you crack 400 whp.
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I've seen too many chipped and cracked pistons to have a desire to keep the stock ones...
 
Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

At what HP level? And plenty have thrown rod and cam bearings after rebuilding the engine, Im not hating on the build at all just askin why not run the bottom end until I gives up the ghost. My bet is other parts would fail before that bottom end. Either way like i said earlier hope you crack 400 whp and any plans do do E85 ?
 
Re: Spartan GL's (12/26/11) PG 19 for Engine REMOVED

crazyguy03 said:
X2. Do what U want. People hating cause they didn't have the money to spend on building a bottom end. If they did have the money, don't ya think they would have of?
You did it right and will officially have a complete built motor. Not just half built like most people do.

Props to your build!
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You realize that his whole "built" engine minus the heads cost less than a turbo build on a stock engine?
 
Exactly. Anyone can throw together a turbo and pray. I like how he is spending the clams and doing a solid build. Even after these cars are already aging. You don't see people these days doin that. They know motors cost 200-300 from the junkyard so if it blows, no biggie.
 
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