Ok, ever since i had the engine rebuilt, it seemed like it did not have the power it should have! IT feels about the same as stock. I have a 5.7 bored .020 over with AFR 190 heads, ZZ3 cam, ford 24lb injectors, slp runners and intake ported as well as the plentum. Tes headers, flowmaster 3in cat back, dual random tech. cats, crane hi6s ignition. I also have a supercharger, but am not running it till i get the car running correct!

It has always seemed like i have lack of hp! Seems no faster than stock! One sympton is that during rush hr traffic when outside temps are above 75 deg, it overheats. Unless i can get out on the open road adn get some are moving.

I have checked EVERYTHING! Air fuel on a dyno wide band showed a wohpping 232hp with 309 Tq. NOt good considering AFR rates it at 450 HP at the fly. Anyway, I think the timing gear is off one tooth, here's why;

Well, I put teh dial indicator on intake valve no. 6. On the compression stroke for cylinder no. 1. the dial indicator read .020 @ 4deg BTDC. It should read .075 because I measrued off the rocker. I moved the crank until the dial indicator read .075 and it is aprox. 20-24 deg BTDC. According to the cam spec's, My LCA is 112 with 108 intake lca. duration is 208. so 208/2 is 104. 108 - 104 = 4deg BTDC + 16 (one tooth) = 20 deg BTDC. I think it is off a tooth! What do you think? does this sound correct?

 

It does look like it is off by a tooth. In this statement: "aprox. 20-24 deg BTDC", did you mean ATDC? That would make it a bit on the retarded side. Either way sure looks like it's off a tooth.

RBob.

 

good lesson in why you degree a cam, it may not be the timing gears that are off. usually if the gears are off a tooth you'll get very poor preformance and idle quality. i'd pull the cover and check the dots.

 

Yep, could also be a mis-marked set. I've seen that once before. Poor guy bent several sets of valves and sold the car ('69 SS Camaro) real cheap. Only for the buyer to discover that the lower cam chain gear was marked incorrectly. The previous owner was at the parts counter and sold the new owner the new gear! One very unhappy previous owner. . .

[edit] wow, in re-reading this my next sentence could be mis-construed. The 'In this case' refers to this thread, not my statement above. [end-edit]

In this case I don't believe that Raiden was the builder.

RBob.

 

Find the peak opening of an intake valve with your dial indicator. That's the intake "lobe center". It's the point all other timing events are referenced to, and the point that the cam is supposed to be installed at. Should be somewhere around 106 - 110° (crank) ATDC. All the rest of that is a waste of time and guessing and BS.

One tooth off on the cam gear is about 18-20°, it depends on teh timing set you use as to how many teeth there are on it and therefore how many ° each tooth is.

 

Thanks for the input! I had the engine built for me and the timming cover was installed when i purchaed the motor. I never tore into that area so i just assumed it was on. I guess not! The builder is gonna help me fix the problem! Thanks again!