Re: Cyl Head Flow importance with boost
[Re: 408strokerdart]
#766135
08/05/10 03:56 PM
08/05/10 03:56 PM
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Joined: Sep 2006
Posts: 411
Portersville, Pa
1badx
mopar
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mopar
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Posts: 411
Portersville, Pa
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Head flow requirements will be dependent on the ci displacement of the engine being boosted.
Forcing air into a cylinder rather than pulling it in with pistons is more efficient but ultimately there is a limit. To make 1200whp you are going to need some efficient heads. Trends Engine Analyzer states that a 500 cid engine need approx. 400 cfm intake at .700 to make 1900 crank hp or 1300whp. A smaller motor is much more forgiving to lower flowing heads which may be what you are seeing. Just look at the Mustang crowd and there 341ci engines making insane power.
Last edited by 1badx; 08/05/10 04:06 PM.
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Re: Cyl Head Flow importance with boost
[Re: 408strokerdart]
#766136
08/05/10 04:35 PM
08/05/10 04:35 PM
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Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
moparts member
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moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Quote:
Just wondering from those in the know. How important are good flowing heads on a boosted engine? I have seen some real anemic heads produce nice power with small flow numbers. I am talking in the 1200 to 1500 hp range with procharger.....what type of head flow do I need?
Your current W8 heads will have no problem supporting that kind of power level with enough boost. Mike Gray was making around 1600-1800 with about same exact W8 head you have, with a more max effort type motor. I'm still screwing with mine on dyno this week, so far I've made almost 1100 @ 9 PSI non intercooled with a 2.15"/1.60" valve small port W9 that does not flow on intake or EX anywhere near what your W8's do... 417 inches, far from max effort type deal cam wise etc. Just street/strip car deal. I'm just having problems making boost... hopefully we will have that sorted out for tomorrow & can approach or bypass the 1200 mark in the 13-15 PSI range.
You put 20+ intercooled PSI into a 415-440" W8 motor it will make 1400-1600 HP no problemo.
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Re: Cyl Head Flow importance with boost
[Re: RyanJ]
#766137
08/05/10 04:56 PM
08/05/10 04:56 PM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
OP
master
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OP
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Posts: 3,456
Out West
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Quote:
Quote:
Just wondering from those in the know. How important are good flowing heads on a boosted engine? I have seen some real anemic heads produce nice power with small flow numbers. I am talking in the 1200 to 1500 hp range with procharger.....what type of head flow do I need?
Your current W8 heads will have no problem supporting that kind of power level with enough boost. Mike Gray was making around 1600-1800 with about same exact W8 head you have, with a more max effort type motor. I'm still screwing with mine on dyno this week, so far I've made almost 1100 @ 9 PSI non intercooled with a 2.15"/1.60" valve small port W9 that does not flow on intake or EX anywhere near what your W8's do... 417 inches, far from max effort type deal cam wise etc. Just street/strip car deal. I'm just having problems making boost... hopefully we will have that sorted out for tomorrow & can approach or bypass the 1200 mark in the 13-15 PSI range.
You put 20+ intercooled PSI into a 415-440" W8 motor it will make 1400-1600 HP no problemo.
Good to hear. I am trying to figure out the right direction to head with mine for next year. Just about have everything in place to start pouring serious power at it (Chassis/transmission). The 10.5 guys here are now solidly in the 5.0's in the heat. 
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Re: Cyl Head Flow importance with boost
[Re: 408strokerdart]
#766138
08/05/10 05:23 PM
08/05/10 05:23 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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10.5 guys in DFW don't mess around. They're trying to pull John Force numbers out of those little tires.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Cyl Head Flow importance with boost
[Re: DaytonaTurbo]
#766140
08/06/10 01:53 AM
08/06/10 01:53 AM
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Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
HEMIFRED
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master
Joined: Jul 2010
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SOUTH JERSEY
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with a set of heads that only flowed 250 cfm at .500 lift we made over 1500hp on alky.one THUMPER turbo 92 mm 
home of the
Sox and Martin Hemi Duster
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Re: Cyl Head Flow importance with boost
[Re: HEMIFRED]
#766141
08/06/10 04:20 PM
08/06/10 04:20 PM
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Joined: Sep 2006
Posts: 411
Portersville, Pa
1badx
mopar
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mopar
Joined: Sep 2006
Posts: 411
Portersville, Pa
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Quote:
with a set of heads that only flowed 250 cfm at .500 lift we made over 1500hp on alky.one THUMPER turbo
92 mm
What size engine? Alky does make a difference!
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Re: Cyl Head Flow importance with boost
[Re: HEMIFRED]
#766143
08/07/10 06:53 PM
08/07/10 06:53 PM
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Joined: Sep 2006
Posts: 411
Portersville, Pa
1badx
mopar
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mopar
Joined: Sep 2006
Posts: 411
Portersville, Pa
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Quote:
Quote:
Quote:
with a set of heads that only flowed 250 cfm at .500 lift we made over 1500hp on alky.one THUMPER turbo
92 mm
What size engine? Alky does make a difference!
400 " alky no cooler needed
I figured it was a small cube engine with the head flow you listed. No intercooler is a real nice thing about alchohol/methanol
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Re: Cyl Head Flow importance with boost
[Re: HEMIFRED]
#766144
08/08/10 05:20 PM
08/08/10 05:20 PM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
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OP
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Joined: Feb 2003
Posts: 3,456
Out West
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Quote:
with a set of heads that only flowed 250 cfm at .500 lift we made over 1500hp on alky.one THUMPER turbo
92 mm
The class I will run allows gasoline only. Will probably do a meth injection on it.
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Re: Cyl Head Flow importance with boost
[Re: blownzoom440]
#766146
08/09/10 04:00 PM
08/09/10 04:00 PM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
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OP
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Out West
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Quote:
will thay allow meth injection or say it is a fuel?would you object to using C-16 fuel?
will you have a boost/timing retarder?
Yes, meth injection is allowed. C-16 is ok...I have been using Q16, C15 and now C14. Yes I will have boost/timing retarder.
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Re: Cyl Head Flow importance with boost
[Re: blownzoom440]
#766148
08/16/10 07:08 PM
08/16/10 07:08 PM
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Joined: Sep 2003
Posts: 1,138
San Angelo, Texas
W8n2DustU
super stock
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super stock
Joined: Sep 2003
Posts: 1,138
San Angelo, Texas
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Id I was going to run the tttf class I would stick with nitrous! The class is designed for nos Cars. An f1 with no innercooler will not compete with a 600 in motor on spray. Jason Lee has the nmca record with a 5.13. Eight different cams and 5 different converters to get it at its best. Just my
2010 Toxic Orange Challenger built by B and B Racecars! All aluminum R4/P5 engine, Proformance TH400 (3 speed) tranny, full Reid case, nodular 9" rearend, full Dragpak suspension, Protorque custom converter, BS3, PTE 85mm turbo, fire core wires, carbon doors, carbon front clip, and a whole lot more!
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sometimes it takes a little more work.[not that you will have to work any harder at it.] 
