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Old 02-29-2012, 05:09 PM
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4.7 boost question

How much boost can I push to a 4.7 with 10:5 CR?
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  #2  
Old 02-29-2012, 05:28 PM
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Re: 4.7 boost question

I personally wouldn't go over 8ibs with stock internals
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Old 04-02-2012, 08:28 AM
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Re: 4.7 boost question

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Originally Posted by mandio23 View Post
How much boost can I push to a 4.7 with 10:5 CR?
What kind of gas is available where you are located? What kind/brand of forced induction? Assuming US-grade 93 pump gas, and no meth, I would suspect no more than 4-6 lbs, you can run more with meth injection. I know Richie was running about 14 lbs on a HO motor but he was running meth.

Cams also play a role in this as well. Overlap is your friend in a case like this.
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Old 04-02-2012, 10:13 AM
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Re: 4.7 boost question

I'd be careful with a non HO motor, the HO's were built a little stronger I assume for a reason.
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Old 04-02-2012, 11:36 AM
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Re: 4.7 boost question

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Originally Posted by 01grand View Post
I'd be careful with a non HO motor, the HO's were built a little stronger I assume for a reason.
With 10.5 CR, he has aftermarket pistons, and some sort of rods other than non-HOs Searching through the OP's posts confirm this. So, not an issue here it seems. Avoiding detonation will be due to the high compression and IAT issues if he runs too small a F/I unit like the infamous KB kit.
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Old 04-02-2012, 08:02 PM
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You'll want a real intercooler unless you want to go through massive amounts of methanol. That's really pushing the limit with compression that high on boost too especially on pump gas. I assume you have had some engine work done and hopefully have forged internals.

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Old 04-07-2012, 03:42 PM
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Re: 4.7 boost question

Yes I had forged internals, water/meth, 12psi, running on c16 racing gas. Few weeks I ago I decided to push my 4.7 to its limit and added a 75 shot NOS. As a result piston/rod #1 flew through the oil pan and the engine block cracked in 4 different places. My engine was built back in 06 N/A and on boost for the last 6 months of its life.
My new engine block should be ready in about 3 weeks.
New 4.7 bottom end Mods
Manley forged pistons 8:1 CR bore at 3.70(+.040)
Custom Carrillo Billet rods
Total Seal rings
Clevite rod and main bearings
ARP Bolts
Forged crank (HO)
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Old 04-07-2012, 03:50 PM
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Hopefully you'll have better luck this time around. A 75 shot should not have done that, so I think something wasn't right.

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Old 04-07-2012, 04:06 PM
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Re: 4.7 boost question

Thanks,


after 6 years of hell, anything was possible...
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Old 04-07-2012, 04:19 PM
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Re: 4.7 boost question

Quote:
Originally Posted by mandio23 View Post
Yes I had forged internals, water/meth, 12psi, running on c16 racing gas. Few weeks I ago I decided to push my 4.7 to its limit and added a 75 shot NOS. As a result piston/rod #1 flew through the oil pan and the engine block cracked in 4 different places. My engine was built back in 06 N/A and on boost for the last 6 months of its life.
My new engine block should be ready in about 3 weeks.
New 4.7 bottom end Mods
Manley forged pistons 8:1 CR bore at 3.70(+.040)
Custom Carrillo Billet rods
Total Seal rings
Clevite rod and main bearings
ARP Bolts
Forged crank (HO)
What kind of power adder were you running? KB? Novi 2000?

Quote:
Originally Posted by scjeep4.7HO View Post
Hopefully you'll have better luck this time around. A 75 shot should not have done that, so I think something wasn't right.

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Quote:
Originally Posted by mandio23 View Post
Thanks,


after 6 years of hell, anything was possible...
Mandio, what was your fuel system like? Were you using stock rails?
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Old 04-07-2012, 05:51 PM
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Re: 4.7 boost question

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Originally Posted by FlyinRyan View Post
What kind of power adder were you running? KB? Novi 2000?





Mandio, what was your fuel system like? Were you using stock rails?

Yes, Unfortunately I'm still running stock fuel system with WK 06 fuel rail. I'm running Novi 1000 with 3.25 pulley on this one.
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Old 04-07-2012, 06:17 PM
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Re: 4.7 boost question

Quote:
Originally Posted by mandio23 View Post
Yes, Unfortunately I'm still running stock fuel system with WK 06 fuel rail. I'm running Novi 1000 with 3.25 pulley on this one.
Why the WK fuel rail???
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