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Re: 481" W8 on dyno
[Re: RyanJ]
#1015581
06/25/11 05:59 PM
06/25/11 05:59 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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Quote:
We turned the 481 to 7500 RPM, peak HP is @ 7200 RPM. I will get dyno sheet up tonight if I have time, just spent a week with a 388" W7 motor on dyno that has occupied more time than I wanted.
I think 880 is about all you could ever ask to get out of a 2.16" valve Nascar truck W8. These were 15 degree Virgin Nascar truck heads from 2001, not CFE 10-13 degree moved Center 2.225 or 2.25" valve heads. The Truck heads have ~2.75" of CSA, the CFE's are anywhere from 3.0-3.25" depending on application, I would have loved to had a set on this motor for more power, but they are hard to find used & not many are willing to pony up the $ for a new set. (besides finding new castings with no spark plug holes is very difficult as well) Also all the ones I ever ever worked on & seen have had significant reliability issues due to everything being paper thin... This motor is for a part time, non points chasing bracket car that has to make 100-150 passes a year, I can't have the heads leaking water & off motor every couple of weeks. Our plan is to freshen this motor every 2 years.
This is my experience.......
I have owned my CFE W8's for over 10 years. With the exception of a couple years where I was either building my house and sit out by choice or changing venues I raced.
Only once did I have to pull the heads and found a leak not caused by some catostropic failure below. This was not a water leak but a leak in the pushrod area of the intake runner. The heads were built and tested for a Pro Stock Truck racing effort by Patterson Racing. I bought them from Patterson. They would never decelerate against the engine as those of us with automatics would.
After a few passes I started getting an oily plug at Englishtown NJ. We performed a compression test followed by a leakdown. No leak in the combustion chamber. Spread some silicone over the effected area and won my first KOS race. I talked with Ray Barton who was very helpful in giving me some tips on handling oil in these engines. I went home and pulled the heads to check all the intake runners. Welded up the effected areas and never had trouble with this again.
I recently had a water leak. Was absolutely sure it had to be the heads. Planning to part out the engine due to a cracked crank I sent the heads off to have them completely checked out and a new valve job done. Several with these heads have tried outsourcing these heads for a valve job. After butchering CFE's trick angles the heads do not perform as original. CFE is one of the two shops I have found that get it right. If done wrong you may have to replace all the seats to get it back to right.
Over 10 years racing/owning these heads I can not blame any problems on the heads. I had a set of Arrington castings that gave far more trouble in this area. They were early Craftsman Truck heads that Bob Kesoloski ran. Not complaining won a lot of races with these to.
Leon
Last edited by Leon441; 06/25/11 06:00 PM.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: 481" W8 on dyno
[Re: RyanJ]
#1015583
06/27/11 11:30 AM
06/27/11 11:30 AM
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Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
jim sciortino
top fuel
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top fuel
Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
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Quote:
Long awaited dyno sheet.... Best pull on Q16 next to best pull on Methanol.
Nice.... 
Are ya going to try C-25???
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Re: 481" W8 on dyno
[Re: RyanJ]
#1015584
06/27/11 12:21 PM
06/27/11 12:21 PM
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Joined: Jan 2003
Posts: 945
La Vernia, Texas
Pat7272
super stock
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super stock
Joined: Jan 2003
Posts: 945
La Vernia, Texas
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Quote:
the other one we ran a few weeks ago with an 11:1 pump gas setup & N20 camshaft, 772 tall deck manifold & Bob Dowling CNC W9 heads made 770HP/680 TQ. So I knew this one with the wick turned up a bit should be pretty decent.../quote]
Can we hear more about this one?!
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Re: 481" W8 on dyno
[Re: Pat7272]
#1015585
06/27/11 03:18 PM
06/27/11 03:18 PM
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Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
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OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Quote:
Quote:
the other one we ran a few weeks ago with an 11:1 pump gas setup & N20 camshaft, 772 tall deck manifold & Bob Dowling CNC W9 heads made 770HP/680 TQ. So I knew this one with the wick turned up a bit should be pretty decent.../quote]
Can we hear more about this one?!
Was same Crank & bore as Rick's... 4.34" crank, 4.20" bore
Cam was in mid 270's @ .050" on 112 with alot of exhaust duration for the N20.
11.5:1 compression
Bob Dowling CNC W9 heads (Semi small port around 275 CC), 2.20"/1.60" stainless valves..
1.6:1 MP/T&D rockers
772 tall deck manifold converted to 4500 flange
Nitrous piston & ring combo. Obviously a decent sized dish to kill compression...
Was 650 TQ @ 4500 RPM & still over 600 FT LBS @ 6800.
Both these motors are real flat up top on HP, where they run out of cyl head, 770 HP range from 6300-7000.
That motor, customer supplied some of the parts like intake, rockers, oil pan, head castings etc. That limited me a little bit on what I could do with it. Rick's I had clean slate of paper to work around a set of virgin Nascar Truck W8s, they were really the only parameter I had to work around.
There is a vid of the Pump gas version on youtube... I did not get chance to take a vid of Rick's motor, he has a crappy one on his facebook page that I saw.
Just finished up dynoing a 388" W7 dirt track motor the other day, it is on youtube as well... Almost touched 700 with it, about right for those Chapman W7s & a 268 @ .050 circle track cam. & I've got a 416 Edelbrock Flat Tappet motor sitting on dyno right now to be fired tomorrow. & I'm currently this afternoon finishing a set of Pro-Filer 13 degree BBC heads for a high RPM 3.75" stroke 500 inch Chevy pulling tractor motor going on Dyno next Tuesday, that should be a fun one as well. & then I've got a 471" 245 CNC -1 INDY head smallblock waiting in the wings as well as a 371" Procharger Edelbrock motor. I doubt we will have time to get the Procharger on dyno next week before Carlisle. The variety of stuff I get to build definitely keeps things interesting.
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Re: 481" W8 on dyno
[Re: ADakotaRTGuy]
#1015587
06/27/11 04:22 PM
06/27/11 04:22 PM
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Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340
master
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master
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
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Quote:
Wouldn't have a set of W9's getting a CNC port job done on the would you?  Those would be mine. Busy man you are Ryan. Do you have special valve covers you use with the W9's?
mine 1st Dave aka dakota 
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Re: 481" W8 on dyno
[Re: RyanJ]
#1015588
06/27/11 05:10 PM
06/27/11 05:10 PM
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Joined: Dec 2006
Posts: 3,395
Pa
Hot 340
master
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master
Joined: Dec 2006
Posts: 3,395
Pa
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Quote:
Was same Crank & bore as Rick's... 4.34" crank, 4.20" bore
Ryan, you think there is any power in staying with a smaller bore on those blocks for rigidity and seal?
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Re: 481" W8 on dyno
[Re: Hot 340]
#1015589
06/27/11 06:11 PM
06/27/11 06:11 PM
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Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
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OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Quote:
Quote:
Was same Crank & bore as Rick's... 4.34" crank, 4.20" bore
Ryan, you think there is any power in staying with a smaller bore on those blocks for rigidity and seal?
No, these bores are plenty thick still @ 4.20.
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