my 66 ford mustang just had the valves adjusted and now the car seems to be alot slower, and it chokes up when it gets above 4800 rpm. it used to go to 6500 rpm. could the valves be too tight? any suggestions would be helpful.
2007-01-29 11:16:41 · 8 answers · asked by girlbld 1 in Cars & Transportation ➔ Car Makes ➔ Ford
6500 rpm's? must be solids on the 271, the stock 225 wouldn't rev that high, why did you have them adjusted, if they are hydraulic, so no adjustment necessary. It is easy to get them to tight and you have to be very careful not to :)
http://autos.groups.yahoo.com/group/classicmustang
2007-01-29 11:30:40 · answer #1 · answered by Anonymous · 2⤊ 0⤋
The proper setting for the valves are 3/4 turn from 0 lash. One by one loosen rocker arm nut until you hear a clicking, tighten nut slowly until clicking stops, now tighten nut 1/4 turn at a time until it is tightened 3/4 turn. I had a 1965 289 4barrel 225 HP. the valves would float at 3,300 RPM,so I played with them, finding 3/4 turns was right. 3 months after I figured out the setting, Ford came out with shop bulletin saying 3/4 turn. By the way I payed $2,658.00 turn key for my 1965 mustang. your 1966 should be worth around 8 to 10 k if in cherry condition. and is a numbered car, being all parts are original. Did I have the only 289 made with hydraulic lifter that would turn 6,800 RPM before the valves would float. It was a 4 speed, had duel exhaust, 3.0 rear end gears. I ran 775 tires on the rear with partial leaf spring between primary and secondary leaf, springs were clamped. I ran 12 degrees advance on the crank. With no other changes it would do 1/4 mile in 13 seconds flat. And yes I out ran 271 HP left and right. My car was built in Kansas on a Wednesday and was the second run on the line.
2007-01-29 12:52:42 · answer #2 · answered by Anonymous · 0⤊ 1⤋
i am not sure what engine you have but most ford v8 engines stock had no adjustments for the valves you either bought longer or shorter push rods,what was your complaint when they decided to adjust the valves? if it was spark knock witch can sound like valves out of adjustment,which would be a common prob with this engine due to the cheep gas we are running these days i would almost bet they retarded the timing and as for setting it pull the spec from the book and set it"advance it 2 deg" how do you know how far they retarded it duh! if they retarded it at all,and yes if they are indeed adjustable and were set cold or wrong this could be your problem
2007-01-29 11:59:22 · answer #3 · answered by kaiser_willys 3 · 1⤊ 0⤋
Sounds like the timing is off, the valves may not have the proper clearance, but most likely your timing is retarded. Try using a timing light and advance your timing 2 degrees by loosening, then turning your distributer. Re-tighten then take it out for a spin. Be sure to listen for detonation, you dont want to advance your timing too much. Hope it helps!
2007-01-29 11:27:24 · answer #4 · answered by n2o96stang 1 · 0⤊ 0⤋
It could be that you're valves are not adjusted right, period...take it to a cartified mechanic and have them adjust them...you'll be much happier.
And on a side note, have you changed your fuel filter recently??? Dirty fuel filters have just about the same problems...
2007-01-29 11:21:55 · answer #5 · answered by Mark D 3 · 0⤊ 0⤋
Sounds like they were adjusted too tight, or adjusted when the motor was cold
2007-01-29 11:23:47 · answer #6 · answered by yfz450chuck 3 · 0⤊ 0⤋
I would have them checked again, they might have set them too tight.
2007-01-29 11:20:59 · answer #7 · answered by mister ss 7 · 0⤊ 0⤋
Were thay adjusted HOT?
If not, they should have been.
2007-01-29 11:21:52 · answer #8 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋