Re: engine won't rev out  
Re: Re: engine won't rev out -- Ken Merring Post Reply Top of thread Maverick Message Board
Posted by: Fred H
02/11/2002, 23:06:08

 :=:=:=:= I would like to know what kind of times you are getting with the cleveland set up in your car (even with the problem you have). I plan on the same basic set up you have for my car later on this year. Also ,I have to agree with Ricky Racers
:=:=:=:=advise concerning the trouble your having.
:=:=:=
:=:=:=I'M RUNNING A 12.7 BUT THAT WAS WITH STREET TIRES. I NOW HAVE MT STREET SLICKS AND A BIGGER STALL. IT LAUNCHES GOOD AND HARD AND SEEMS TO PULL HARD TO ABOUT 5500 AND HOLDS THERE. DURING THE BREAK IN PERIOD WITH OPEN EXHAUST THE CAR WOULD HAVE TURNED 7000 GRAND EASY. THAT IS WHY I DON'T THINK THE ADVICE ABOUT THE CAM I'M GETTING IS CORRECT.
:=
:=
:=:=................
:=:=Believe what you want about your cam. The specs you gave ,I found on the Lunati site are for a hydraulic that has a top of 6000 and you cannot wind a hydraulic to 7000.
:=
:=************************************************************
...By golly Fred, sure ya wasent hittin the hooch a little and that old time tach was accurate? Yes your quite correct on the effects of valve train abuse. We run 358 4 barrels on alky in sprint cars and the cams are all solid lifter in the duration range of 294 degrees at near 600 lift including 1.7 roller rockers. The rpm range on 1/3 mi dirt is around 4500 off the turns to near 7800 at the end. Some of the drivers are WOO and one has to have his sh t togather. It's like putting a bunch of wolves in the same box togather and throwing them some fresh meat.
...The BRIGGS go kart engines I build as limited modifieds run a cam duration in the same range as above and we turn them in excess of 9500 on the long road courses that have long straights in order to have enough gear to pull the short turns hard.
..Nice hearing from you.
Ken

**********************************************************

Ken, can you bolt together one of those Briggs motors together for my Maverick? Probably make more power than my tired old Windsor.

What do you do to those things to keep them in one piece? I hear you can easily spend as much $ on one of those as a good old fashioned v-8.

You say that those sprint car cams have 294 degrees of duration. Is that at .050 or advertised. I assume by the RPM range and the cam lift it is advertised. If advertised what is duration a .050?

Couple of other sprint car questions for you. I know that there is a class for motors around 410 ci. Do they run ~3.75" stroke with a large bore or ~4" stroke with a smaller bore? How hard do they turn them? Reason why I am asking is that I am going to be starting on a 408W (4" stroke) after the summer and have everything figured out except exact cam specs. I've got TFS High Ports, ~13.5 compression, Super Victor Manifold, 950HP carb and 4.30 rear end. Figured on a solid flat tappet .650-.675 lift, ~265 @ .050 intake dur/~270 at .050 on the exhaust (want to have a few more degrees of exhaust duration since I'm trying to shove all of it through a dinky 1.75" header tube). I am a little fuzzy on the lobe separation. I am thinking of 110 but am concerned that may be a little too tight. Do you think 112 would be more appropriate? Thinking this motor will be done between 7200 - 7500rpm.

BTW no hooch and pretty sure the tach was accurate (it was set up for 8 cylinder) although had no reason to test it against anything else.

Thanks for the help.


Post Reply | Alert Original message Top of thread Return to the MMB

Replies to this message