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302 compressoin 

 

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 Post subject: 302 compressoin
Posted: Sat Mar 07, 2009 7:11 pm 
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hi im building a 302 clevland and i am un sure on the cumbustion chamber cc,s so im un able to work out the comp the rest off the moter has 50'' th deck hight 50''th thick head gasket and 30''th thumb print left on the heads any info would be great cheers.....
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 Post subject: Re: 302 compressoin
Posted: Sat Mar 07, 2009 8:09 pm 
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forgot pistons are flat tops with 7cc fly cuts
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 Post subject: Re: 302 compressoin
Posted: Sat Mar 07, 2009 10:11 pm 
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URGENT!!!!! any input would be nice heads are closed chamber as well
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 Post subject: Re: 302 compression
Posted: Sat Mar 07, 2009 11:05 pm 
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Too many variables....
Get yourself a syringe , some water and cc them yourself !!

 

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 Post subject: Re: 302 compressoin
Posted: Mon Mar 09, 2009 5:28 pm 
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0.050" deck height?? WTF??? I hope you don't plan to run it on unleaded, I suspect it will be detonating on you.

2V Closed chamber heads standard are 61cc. I guess you could use this as your starting point but whether your heads have been modified is anyone's guess.

 

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 Post subject: Re: 302 compressoin
Posted: Mon Mar 09, 2009 6:20 pm 
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Using the specs that you have given I put those into the compression calculator from this website http://www.csgnetwork.com/compcalc.html and came up with 9.26 to 1.

 

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 Post subject: Re: 302 compressoin
Posted: Wed Mar 11, 2009 10:31 pm 
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Trick Flow EL wrote:
Using the specs that you have given I put those into the compression calculator from this website http://www.csgnetwork.com/compcalc.html and came up with 9.26 to 1.


9.2 Compression??

Try about 8.1 compression.

7 cc piston volume? Probably not.
.050 deck? Usually .041 thou.

3" stroke i assume?

 

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 Post subject: Re: 302 compressoin
Posted: Wed Mar 11, 2009 10:42 pm 
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Posts like the last one is why not many people will try to help you out.

 

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 Post subject: Re: 302 compressoin
Posted: Tue Apr 14, 2009 11:58 pm 
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i cc'd the heads came up at 50cc ran it all thou that comp calculater n got 9.2 something to 1 dos that sound right ? id never seen one off them comp calc makes life a lot easyer now i no... i was aiming for 9.5 so i might get some thiner head gaskets...
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 Post subject: Re: 302 compressoin
Posted: Wed Apr 15, 2009 1:29 am 
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5.0 is usually around 60 cc chambers
.035 head gasket [varies]
Approx 5 to 8 cc valve reliefes etc..
Comp should be just over 9 to 1..
Carefull with valve to piston clearance changing things around..
The closer piston is to deck ..Less chance of detonation ...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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