Inliners International Forums General Discussion Truck Talk 292

got a 292 in my 4x4, 40 over , propane pistons, 204 intake , 216 exhaust [durationn]at 50 ,498 530 lift respectively, offy intake , holley 465,new everything internal,stock head. motor wont turn but 3500 rpm .need more power . also cast "stovebolt" exhaust from langdon. help!!!!!

Is it possible that your exhaust is plugged? Did you degree the camshaft when installing it? How does it sound? - snappy?- slow to rev? - blow a lot of black smoke?
Additional information will be necessary to help with your problem.

Jim

i am sure the exhaust is not plugged,installed cam strait up, but did not use degree wheel. sounds raspy, throttle response is great . no black smoke. pulls great to 3500, will turn 4000but thats all.2.25 dual pipes back to flow master 70 series w/ 3" exit

i have fooled w/ timing and the carb till i am dreaming of it at night. i wonder if the cam is "large" enough or is the head holding me back. the truck is heavy 4600 lbs. do i need a clifford lump port?

Any chance it is running out of fuel (volume or pressure) at higher rpm? Have you had the distributor checked on a machine to make sure everything, including the advance works correctly at higher RPM? It's not a distributor off a truck with a governor?? Coil, wires, plugs etc in good working order?

Silly last possibility. Assuming it is a recent rebuild or upgraded motor, did you put a high volume oil pump in? The pump coupled to heavy oil, may cause a major drag on the distributor and not allow it to turn any faster. I have not seen this rpm limitation, but have seen broken pump tangs and stripped distributor and cam gears from it.

could be carb , i have never liked it, want to try a 390 holley 4. will check dist./ advance. i used a standard oil pump. thanks

The high volume pump and heavy oil?? I ran a high volume pump & 20/50 weight for oil @ 7000 plus rpms With stock and Non Stock dist gears NOt a issue. Whos cam? What Gearing are you running? and what tire size. I have seen this Issue come up on my buddies Pinto one time after we change out the rear end The Gearing in it was way off and the car would never run over 4500 and I'm thinking like 50-55 mph at best. But the stock rear end back in it and Run like it's Butt was on fire and 6000 rpms Hope this helps}[oooooo]

As I see it you are under 300 cubic inches and hovering around 10 to 1 compression so even with a stock spec head you should be able to run up to 4500 or more. Sounds like the engine is just plain running out of fuel after 3500 rpm if the timing and everything else is correct as you say it is. A Holley around 450 - 485 cfm should let that engine run up higher than 3500. I'd rejet it richer starting with only the primaries until it ran well with no smoke and then do the secondaries. A 600 cfm might be a better choice in the long run but there are plenty of 292s running around with 500 Holleys and Edelbrocks that turn well over 3500 so I'd work with it for a while before I swapped it out.

Mike

thanks for yall's help . the gesring is 3.42 w 33 12.50 15, tires. i plan to change to 4.11 gears w / 35 " tires . will probably tune on carb this weekend.

it's a wolverine blue racer , bought from tom langdon by the way. the specs are in 1st paragraph

The cam isn't holding you back and the exhaust and stock head should be plenty good for 4500 or more. Also the carb is big enough for that engine speed too.

Assuming that the ignition isn't breaking up at 3500 I would check:

1) that the carb is opening all the way,
2) that the distributor advance is operating properly and the timing is set at the right advance,
3) and that you aren't loosing fuel pressure for some reason at 3500 rpm; bad pump, plugged filter, kinked/flattened fuel line, plugged screen in the tank.

Tom

I would bet my money on the valve springs. I see you have installed a small performance cam. Did you install the recommended spring to go with the cam? Did you check the pressure on the spring you did use at installed height? New or not, you have to check the pressure. Even brand new performance valve springs can be too soft if not shimmed to teh required installed height.

If the springs are good, I would move on to the ignition system. Voltage at the coil needs to be a solid 12+ volts at all RPM.

What type of ignition are you using? If it is an HEI, there are many things that can cause the problem you describe, but most are terribly rare. Things like the module going bad, the magnetic pickup covered in oil and malfunctioning. etc.

I would start with the valvespring and work from there.

Good luck
RobT

tryed an edelbrock 500 cfm performer. it will turmn all the way to 5500 now.