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Author Topic:   power loss
jeramiewi
Dirt Roller

Total posts: 13
posted June 12, 2005 08:39 PM  
I put a new motor in and it seems like it dosen't want to run over 6000 rpms. I have cam just under 480. Also I have 1.6 rocker arms. I ran very strong but at the end of the straight away I have nothing left. After I get off the gas and get back on it everything is fine until I reach about 6000 rpms. Also I have new z-28 springs. I have a idea what it might be but some expert input would be helpful.

racer17j
Dirt Forum Champ
Total posts: 5390
posted June 12, 2005 09:47 PM  
try slapping a set of 1.5 rockers on it and see if that helps you could be coil binding your springs

drive hard or drive home

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted June 12, 2005 11:02 PM  
the z-28's wont bind with that amount of lift. I ran around .550 lift both sides last year with z-28 springs up to 7000 with no problems. Sounds like you've got a weak valve spring somewhere, or you may be simply floating the valves. The acceleration rate of the cam may be greater than the spring pressures at the seat needs. Another thing to look at is your distributor. If it is electrical you'll be able to tell right away.

jeramiewi
Dirt Roller

Total posts: 13
posted June 13, 2005 06:07 AM  
I have a marine intake and a stock dist. I have a 2 barrel rochester carb. What can I do to gain a few more rpms. What does floating the valves mean. I not sure I completely understand what this means. Can this hurt my motor.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted June 13, 2005 09:42 AM  
You will want to invest in a good HEI Module and Coil for your Distributor. The Stock stuff is lucky to see 6000.

Floating the valves is where the valve springs are too weak to keep the lifter in contact with the cam. This is caused by a couple of things:

Too light valve spring pressures for the cam you are running
Too much RPM
acceleration rate on the camshaft too great for the valve springs

Your definately not floating the valves if its a stock HEI.

streetstock82
Dirt Forum Racer

Total posts: 81
posted June 13, 2005 02:47 PM  
also if your cam is hydralic, you may have a lifter problem. it my be bleeding down too much. if it's a solid, then your running out of fuel,air or you have a valve train problem

jeramiewi
Dirt Roller

Total posts: 13
posted June 13, 2005 03:09 PM  
It is a hydralic cam and the lifters are new. I look at my gas tank and the hose was loop up out stick just out of the gas. Maybe that was the problem. I just cant see how that was it because when I got back on it out of the corners it didn't lug or nothing it was strong. Thank you for the comments. Keep them coming.

leapinlizard
Dirt Freak

Total posts: 402
posted June 14, 2005 01:20 PM  
Maybe the fuel settled and covered the pick up long enough in the center of hte corner to refill the bowls till they ran out agian at the striaght???

jeramiewi
Dirt Roller

Total posts: 13
posted June 15, 2005 03:31 PM  
I took my dist. off and there was a small spring laying in their. I looked at my trucks dist. and I think I know where it goes the only thing is I don't know what it does. Would this spring being out cause the problem that I am having with high rpm power loss.

IowaFuzzy1
Dirt Maniac

Total posts: 136
posted June 15, 2005 11:33 PM  
The spring is off of your advance weights,they usually come off due to excess wear.You need to thoroughly check your distributor and either convert it to locked or replace it.

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