still wounded

[Pit Boss]

As most of you know I have been having problems with my motor. Still trying to get the bugs out of it.

It is fine in the lower rpm's but falls on its face on the top end. I have been messing with the jetting to no end. It has gotten a little better, but still not right. It ran decent in peoria and then faltered again at the peat monster the following weekend.

Under no load it will rev to the moon. Under load it struggles to get past 6, even in first gear. When I get air born the revs don't really come up. I have never had the rev limiter kick in. I have changed everything that I could possibly think of.

Things that I have changed include:
Coil
Msd box
Wires
Plugs went from heat of 8 to 7 and closed up the gap a little
Air Cleaner
Jetting
reset valve lash..... did it again
Fuel pressure as well as flow are fine
fuel filter changed
Checked grounds and ran msd box straight from the battery.
unhooked tach




I am no carburetor expert. I bought mine from a friend and had one o my buddies build it. He has been running them for many many years and has a drag car that runs in the 6's. He has his own stuff to work on let alone help me out and really hate to pester him. I am going to swap it out with a different carb just to see what shakes.

Is there something in the circuts on the metering block that could be wrong. There are no power valves as well. The fuel levels in the bowls are spot on.

Is there something that I am missing. I think that I am down to my last straw. The only other thing that I can think of is to try a colder plug. I would not think that I would need a 9, but hey you never know.

So throw something at me.

thanks

jenks

[maroonrocket]

jenks

cant remeber you say that thing has a flat tappent or roller cam? sure sounds like a cam going south to me. or maybe valve springs? do you have another carb to throw on it?

Dexter

[Pit Boss]

It is a solid roller. Forgot to mention that as well. I checked all of the valve springs for seat pressure, and all checked out. It is all comp cam stuff matched to their spec. I may need a heavier spring possibly.

This has been an issue since the motor was out of the box. Just been limping it along last year to run, and dial it in this year.

Louie has a dominator that I am going to go and grab tomorrow to try out. Sounds like it is the same old school version as mine, so we will see what happens.

On a side note I also run a retard box that I have bypassed as well.

Maybe my motor is just a dog.

later
jenks

[fordsrgrt]

distributer?

[Pit Boss]

replaced cap / rotor with no change.

[MJ]

Double check your timing make sure your timing mark is dead on with it at top dead center. You never know. Do you have your distributor locked or run with weights.

[Pit Boss]

timing is set at 36. Dizzy is locked out.

I have tried from 36 to 40 with no apparent difference.

Hmmm now that I think about it I ran 36 in the year early last year and brought it up to 40 42 at the end of the year. Put it back down to 36 at the begining of this year. Maybe something to play with a little more.

Did have my backfire problem at the beginning of the year and got rid of that with the jet size. It did backfire out the exhaust again at the peat monster at the last race.

It is a BBC with high compression. running 114 fuel.

later
jenks

[mj]

Double check TDC make sure #1 piston is topped out and then see where your timing mark is on your balancer. may have spun your balancer, I`ve seen it happen before.

[mj]

you shouldn`t have to run more then 36 to 37 degree timing.

[McQ]

Jenks,

I too like the carb switch first. Also I have spun a balancer before so check TDC on #1. Were the springs matched to the cam? Are they comp triple springs?

Jeffro

[Pit Boss]

Springs are matched to the cam. Recommended springs by comp. They are here www.summitracing.com/parts/CCA-944-16/.


I run the ATI Super Damper balancer. I sure hope it did not move on me.

I am down to fuel and timing. Grrrrr. Heading down to Lewiston here shortly to meet up with louie. Guess there is a bog down there at the fulton county fair grounds. Just heading down to watch and grab a carb.

I don't want to get my hopes up just to be bashed back in my face when the new carb doesn't work. Then it will be over to galesburg so I can get my "super tune" on my 468. cough cough

Later
jenks

[maroonrocket]

cam guys are bad about not recommending the right springs! what were to happen if you took your air system off and run it down the road is it still a pooch?

[jfmudracing]

I'm no expert but it sounds like weak springs to me.

[just4playmudracing]

jenks

What do the plugs look like? Doese it miss at topend or just won't build power? I think you need a front power value. take a rocker arm off see what pattern you have on top of the value. it should be a line down the middle of the value if its a star or a cross its a value spring problem.

David

[McQ]

Jenks come to Galesburg for the SUPERTUNE!!


Eugene just checked my valve stems. All "stars" no kidding an I didn't even think I had a problem??


Jeffro