Flat Tappit Cam & 9400 RPM
#958486
03/25/11 02:26 PM
03/25/11 02:26 PM
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Joined: Sep 2008
Posts: 29 Washington State
lorenr
OP
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OP
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Joined: Sep 2008
Posts: 29
Washington State
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I look at e bay all the time in order to see what is for sale. There have been a lot of R5/P7 and now R6/P8 engines listed. I've noticed that many of the R5/P7's are for sale between $6,000 to $11,000. The dynamometer sheets indicate maximum power at 9400 RPM with a flat tappet camshaft. The things evidently make 860 horsepower there as well. How do they do that and keep the motor alive for 500 miles?
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Re: Flat Tappit Cam & 9400 RPM
[Re: lorenr]
#958487
03/25/11 02:33 PM
03/25/11 02:33 PM
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Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,243
Bend,OR USA
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Quote:
I look at e bay all the time in order to see what is for sale. There have been a lot of R5/P7 and now R6/P8 engines listed. I've noticed that many of the R5/P7's are for sale between $6,000 to $11,000.
The dynamometer sheets indicate maximum power at 9400 RPM with a flat tappet camshaft. The things evidently make 860 horsepower there as well.
How do they do that and keep the motor alive for 500 miles?
Moderm american technololy The Formula 1 motors rev a lot higher, so do road race motorcycles Test, test, and test some more to find the weak parts and then fix it
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Flat Tappit Cam & 9400 RPM
[Re: Cab_Burge]
#958488
03/25/11 02:45 PM
03/25/11 02:45 PM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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Posts: 10,011
Frostbitefalls MN (Rocky&Bullw...
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I've heard they run ceramic type lifters so they can use more spring? I would think they run a very high rocker ratio also to get the least resistance to cam opening. Ti valves, retainers, just guessing here though.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Flat Tappit Cam & 9400 RPM
[Re: gregsdart]
#958489
03/25/11 03:45 PM
03/25/11 03:45 PM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
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master
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Posts: 5,080
organ
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there is a surface prep used also- nitriding? crs. you can order this treatment from comp, irc (crs, remember?).
for what is the good life if not doing things thoughtfully?
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Re: Flat Tappit Cam & 9400 RPM
[Re: maximum entropy]
#958492
03/25/11 04:46 PM
03/25/11 04:46 PM
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Joined: Jan 2003
Posts: 75,070 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,070
U.S.S.A.
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Quote:
there is a surface prep used also- nitriding? crs. you can order this treatment from comp, irc (crs, remember?).
Yes , comp charges 150 extra to do it .
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Re: Flat Tappit Cam & 9400 RPM
[Re: JohnRR]
#958493
03/25/11 06:11 PM
03/25/11 06:11 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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Comp Cams Plasma Nitride coating. Here is a picture, of a cam I had done.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Flat Tappit Cam & 9400 RPM
[Re: fishy340]
#958496
03/26/11 10:57 AM
03/26/11 10:57 AM
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Joined: May 2003
Posts: 2,117 Cleveland Ohio
10secGTX
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top fuel
Joined: May 2003
Posts: 2,117
Cleveland Ohio
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Quote:
i would say after 500 miles they put a new cam,and springs in it...not sure
A whole New Engine ! and Trans
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Re: Flat Tappit Cam & 9400 RPM
[Re: fishy340]
#958497
03/26/11 10:59 AM
03/26/11 10:59 AM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
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Posts: 3,082
St. Paul , Mn.
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After 500 miles , most of it winds up on ebay. The parts are better now, than when I had " inside " info on the sport. But back in the early 80's , after a 500 miler , most of it went in the scrap bin. Back then , I was pondering what they did with all their old parts..........thinking there might be a home for them in a less demanding environment. And today , they devote a lot more resources to R&D , so there are a lot of parts that have never run a lap getting sold.
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Re: Flat Tappit Cam & 9400 RPM
[Re: tubtar]
#958498
03/26/11 12:00 PM
03/26/11 12:00 PM
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Joined: Feb 2003
Posts: 8,020 Pangaea
B5 Bee
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Pangaea
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20 years ago, I knew an metallugist that did damage analysis for Hendrick. When he told me the spring pressures they ran, I asked how the cam and lifters survived. He said the cam cores were made of cast iron and were intended to be sacrafical. Since the lobe has more surface area than the lifter, it took longer to wear the lobe than the small contact patch the lifter has. The cams did have problems with pin holes in the core casting and the had a lack of tortional strength. He showed me cam that came out of the #3 (not a Hendrick car ) that broke between the 6th and 7th lobe set from a pin hole and tortional twisting due to the lifter loads from the high spring pressures. This was years before ceramic lifters came about and the 9400 RPMs they turn now.
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Re: Flat Tappit Cam & 9400 RPM
[Re: B5 Bee]
#958499
03/26/11 06:06 PM
03/26/11 06:06 PM
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Joined: Jan 2003
Posts: 6,147 Melbourne , Australia
LA360
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Melbourne , Australia
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They use powdered metal cam cores with DLC coated lifters nowadays. I think before that they were billet steels cores with the same lifter. Some of the Super Stock classes here is Australia mandate the use of flat tappet lifters. Those racers kill a set of springs a meeting and running through the traps anywhere between 9-10K.
Alan Jones
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