Re: 505 motor made 805 hp
[Re: AndyF]
#55575
04/01/08 10:07 AM
04/01/08 10:07 AM
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Joined: Jan 2003
Posts: 14,515 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
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FWIW, one of my customers is running the 572-13 heads with 1.7 Jesel rockers and a .775 lift cam, using the spray bar valve covers. 3 seasons, no problems at all.
another has a 622 with 600-13 heads, .880 lift cam, triple springs, 1.75/1.7 rockers.....no problems with the spray bar oiling.
all im saying is.....there are plenty of people out there using it succesfully, so its not like it wont work.
both of those motors are running ball/ball pushrods.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 505 motor made 805 hp
[Re: AndyF]
#55576
04/01/08 10:09 AM
04/01/08 10:09 AM
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Joined: Jan 2003
Posts: 16,934 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
Last time it was on the dyno it made about 740 hp. Major change was from a big flat tappet cam (Comp MM305) to a roller cam. The roller cam had a few degrees less duration than the flat tappet but a ton more lift. Lift went from .650 to .830 on the intake side.
I bet if you look at the duration at 0.200" tappet lift, you will see the roller has more duration giving "area under the curve" for more cylinder filling.
That is one stout combo.
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Re: 505 motor made 805 hp
[Re: fast68plymouth]
#55580
04/01/08 11:58 AM
04/01/08 11:58 AM
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Joined: Jan 2003
Posts: 31,110 Oregon
AndyF
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 31,110
Oregon
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Those were the peak numbers recorded on the run but the dyno operator was backing off the load since the torque gauge needle was pegged. My guess is that the motor would've made a little more power on a SuperFlow or DTS setup that was capable of more power. On the other hand, we might have just blown the bottom end out of the block if we had loaded it hard for another 1000 rpm.
Jim - actually the roller cam has less duration at 50 and 200 than the MM305 flat tappet. I'm pretty sure it has more duration at 300 lift and above though but I didn't measure those points. I think this is just an example where the published cam info doesn't really convey the full picture.
Actual numbers on the camshaft: MM305 intake lobe is 305/279/197 for the seat duration, 050 duration and 200 duration. This roller cam was a 1722 intake lobe which is 308/275/195 so a tiny bit bigger on the seat but a tiny bit smaller on the 50 and 200 duration. These cam lobes were selected to have identical duration to the flat tappet but more lift. That was one of the things I was interested in looking at.
Of course, it isn't apples to apples since I used a 1.50 rocker arm with the MM305 and a 1.70 rocker arm with the roller. The bigger rocker arm ratio gets the valve open sooner so the valve sees more duration.
Last edited by AndyF; 04/01/08 12:07 PM.
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Re: 505 motor made 805 hp
[Re: earlybee]
#55582
04/01/08 12:34 PM
04/01/08 12:34 PM
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Joined: Jan 2003
Posts: 732
mikemotorhead
super street
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super street
Joined: Jan 2003
Posts: 732
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"all im saying is.....there are plenty of people out there using it succesfully, so its not like it wont work." both of those motors are running ball/ball pushrods. " -------------------- I have 2 seasons on my Ball/ball Jesel combo with the spraybars and have not had any problems! Mike
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