This is topic wat needed for highest compression? in forum Tech Talk at Northern California Ford Owners  .


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Posted by mrcoupe (Member # 8912) on :
 
hey guys.i have a 93 5.0 motor that im rebuilding and my intention is to go straight carburated and make my coupe a track car with 175 shot.im of course going to do all the nessesary changes and get all the right parts i need to accomplish this.
my question is wat pistons/crank if needed do i need to get to obtain the highest compression i can get.because nitrous likes high compression right? looking to be around the 10.5 11.1 ratio
 
Posted by Phil G 59 (Member # 10028) on :
 
Small combustion chamber and domed pistons :-)
 
Posted by MauriSSio (Member # 9943) on :
 
quote:
Originally posted by mrcoupe:
hey guys.i have a 93 5.0 motor that im rebuilding and my intention is to go straight carburated and make my coupe a track car with 175 shot.im of course going to do all the nessesary changes and get all the right parts i need to accomplish this.
my question is wat pistons/crank if needed do i need to get to obtain the highest compression i can get.because nitrous likes high compression right? looking to be around the 10.5 11.1 ratio
which heads you going with?as was mentioned before, combustion chamber size makes a big difference and valve layout can factor in to the selection of pistons
 
Posted by mrcoupe (Member # 8912) on :
 
well im going to run a wet kit with 175 shot so proly go with the gt40p heads or sumthin aftermarket.some dome pistons i heard were good and some flat tops are good too but flat tops are a no no with nos right?
 
Posted by MauriSSio (Member # 9943) on :
 
quote:
Originally posted by mrcoupe:
well im going to run a wet kit with 175 shot so proly go with the gt40p heads or sumthin aftermarket.some dome pistons i heard were good and some flat tops are good too but flat tops are a no no with nos right?
flat tops should be fine, dished pistons as well. Just depends on combination of piston and combustion chamber size to get the compression youre looking for.
 
Posted by mrcoupe (Member # 8912) on :
 
cool
 
Posted by Boss 327 (Member # 9143) on :
 
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
 
Posted by mrcoupe (Member # 8912) on :
 
quote:
Originally posted by Boss 327:
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
Well if I can get more out of it that would be nice.how high compression can I get out of it?
 
Posted by MauriSSio (Member # 9943) on :
 
Which octane are you trying to run?
 
Posted by Boss 327 (Member # 9143) on :
 
quote:
Originally posted by mrcoupe:
quote:
Originally posted by Boss 327:
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
Well if I can get more out of it that would be nice.how high compression can I get out of it?
If your running race gas, you can get up to 14:1-15:1
 
Posted by mrcoupe (Member # 8912) on :
 
quote:
Originally posted by MauriSSio:
Which octane are you trying to run?
It's a straight track car so Proly 100 or race fuel.depending on my setup.
 
Posted by mrcoupe (Member # 8912) on :
 
quote:
Originally posted by Boss 327:
quote:
Originally posted by mrcoupe:
quote:
Originally posted by Boss 327:
If this is a track car, why limit yourself to 10.5-11:1 compression ratio?
Well if I can get more out of it that would be nice.how high compression can I get out of it?
If your running race gas, you can get up to 14:1-15:1
Would that be fine for 150 or 175 shot?
 
Posted by 79 cobra (Member # 10137) on :
 
if your gonna use nitrous i would keep the compression ratio around 11;5;1-13;1 speacially with a 150-175 shot
 
Posted by Boss 327 (Member # 9143) on :
 
Here's a nice high compression nitrous car:

http://www.wmdracing.net/forum/showthread.php?2144-New-guy-from-Texas!&p=22875#post22875
 
Posted by 93coupessp (Member # 8418) on :
 
My buddy runs 15:1 with two stages equaling 300. Nitrous is about the tune and the fuel.
 
Posted by mrcoupe (Member # 8912) on :
 
Right on guys I appreciate all the input.gona start looking for parts here soon and get it Rollin [burnout]
 




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