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Old 03-06-2007   #16 (permalink)
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I can appreciate how you feel. I didn't have a blower, but Ford's pulling my engine right now. For some reason it lost almost all oil pressure. The engine only has 6500 miles on it, so after the new one's in, the old one is going back to Detroit for a post-mortem. Luckily though, mine's covered under warranty. The garage looks awfully empty right now.
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Old 03-07-2007   #17 (permalink)
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Quote:
Originally Posted by blueoval View Post
So how much boost are you planning on running?
a lot if he plans on running less than 9:1 compression.

My buddy ran a vortech T-trim on a built 2V, with 9.5:1 compression and no intercooler, running ~18 psi of boost. IAT's were in the 160's and he ran 16* timing. Water injection helped cool those IAT's in the hot summer months, but even with out it, it was very safe.
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Old 03-07-2007   #18 (permalink)
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Quote:
Originally Posted by markwondi View Post
a lot if he plans on running less than 9:1 compression.

My buddy ran a vortech T-trim on a built 2V, with 9.5:1 compression and no intercooler, running ~18 psi of boost. IAT's were in the 160's and he ran 16* timing. Water injection helped cool those IAT's in the hot summer months, but even with out it, it was very safe.
Yes I was thinking he must be planning on a lot. I read a couple threads and people was saying flat tops are good for 4v's. How much compression will flat tops yield. I would keep it around 9.5:1 or something.
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Old 03-07-2007   #19 (permalink)
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Quote:
Originally Posted by blueoval View Post
Yes I was thinking he must be planning on a lot. I read a couple threads and people was saying flat tops are good for 4v's. How much compression will flat tops yield. I would keep it around 9.5:1 or something.
Flattops on a 4V= 9.8:1 compression, very little over stock.
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Old 03-07-2007   #20 (permalink)
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Quote:
Originally Posted by markwondi View Post
Flattops on a 4V= 9.8:1 compression, very little over stock.
I guess he wants to be safe as possible. Sometimes sacrifice some hp for reliability. I would atleast keep it in the low 9's.
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Old 03-07-2007   #21 (permalink)
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Originally Posted by blueoval View Post
So how much boost are you planning on running?
Aiming at 15psi or more. From what I have been told (since I am a little sketchy on the math involved) the compression should run around 9.1:1 If someone knows specifics of what a stroked 4.6L with 7cc dished pistons will run at I would love to see the calculations.

Since I am Stroking the engine from a 281ci to a 302ci and adding Hooker Long tubes at the same time I figured the trade off in HP was worth the safety of the reduced compression (I never want to have to do this again)
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Old 03-08-2007   #22 (permalink)
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Quote:
Originally Posted by Slypstream View Post
Aiming at 15psi or more. From what I have been told (since I am a little sketchy on the math involved) the compression should run around 9.1:1 If someone knows specifics of what a stroked 4.6L with 7cc dished pistons will run at I would love to see the calculations.

Since I am Stroking the engine from a 281ci to a 302ci and adding Hooker Long tubes at the same time I figured the trade off in HP was worth the safety of the reduced compression (I never want to have to do this again)
I know how you feel about blowing a motor have dont it three times. But I would atleast keep it in the 9's or mid 9's. It's never a guarantee the engine will last being forged and everything. I had mine all forged and cams put in within 400 miles a couple valve guides broke and went through two pistons causeing damage and had to take it back apart and new pistons. I hope you dont have any problems and have fun with your build.
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Comp cams XE262AH,T-45 with tri-ax shifter for sale
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