hi all
l have a 69 mach1 351 winsor . on tick over it's not to bad ,but when i rev the throttle a bit the whole car vibrates i think the hamonic balencer is 28'oz and i think the flexplate is the same but not sure . please can you
help any info would be of help

p.s
l dont know if this helps but the number on the flexplate is 0180121 and is 157 teeth and the balancer at the front of engine is 1c-9139 & Eooo

thank you mike from england uk

 

Yes, the balancer and flexplate are 28.0 ounce imbalance.

 

hi how can i tell what flexplate i have 28oz or 50oz the only nbr on it is 0180121
is there a visable diff to look because there aint many in the uk to look at;
please can some one help cause i have alot of vib , my engine is a new 351 crate motor from the states cant tell you much more im afraid .

cheers mike
england

 

Have you checked engine and transmission mounts?

 

the car is restored , it has all new mounts ie engine and gearbox, the engine has 4 bolts to hold the front pulley and not three i dont no if that helps for the age the motor was made, i just thought people over in the u.s might have come across this problem before , in my head think''s its a balance problem with the damper and flexplate. how would you know what plate to put on the back of the engine , does the age of the motor dictate the flexplate . if any one can help it would be great thank you

mike.

 

351W only use the 28oz balance factor. The reason I mention mounts is that one or more may not be tightened completely or could have failed. What type of mounts are you using also? Poly mounts will transmit more vibration into the chassis.

 

hi thanks for replying ,good point but not sure and since the garage has stopped trading now , so i cant ask, but just incase how do i know that i have the right plate. having said that you see i baught the car about 2 yrs
ago it had no engine but had a new art car c4 gearbox and plate so the garage got a 351 shipped in from the states along with whatever else it needed, hope this makes it clearer . thankyou
mike

 

The size of the weight welded to the plate is visibly larger on a 50 oz

 

is the balancer new?

 

hello
the engine is a new create engine from the states that's for sure and as far as i know the damper is as well but i did give them a 351 with all on it , they crack tested the block and found a crack around the cam shaft area so dumped the engine but they might have used the damper , can any one give me a rough idea of the waights visule 28 and 50 oz of the flexplate mine is aprox
4in long 1in wide and 1/2 in thick . any info would be appre as parts are harder over here. thank you .