New Motor - What's Happening Here?

[Anonymous]

Guy's give me some places to start looking here. My buddy and I just got his '67 back on the road with a new motor.

Specs:
200" motor, 221 MaxEcono head :argie: , 38/38 DGES Weber, 264H Clifford cam, 9.25:1 CR, 1.6 rockers, DII dist, 3spd + OD tranny.

Symptom:
On a hard, WOT run 1st gear pulls nice and smooth past 5K rpms, 2nd seems ok, but a little choppy, 3rd gear it gets choppier until about 2,500 rpms where the engine begins surging badly. Keeping my foot on the floor 3,500 rpms comes around and the engine basically lays down (practically turns off). There is a smooth/quiet coast back down to around 2,500 rpms (foot still on the floor) where it will begin bucking and surging again. If you let up on it, you can cruise it around very nicely without hessitation or smoke.

Sounds like it's running out of fuel to me. The pressure on the Weber is set to 3psi - new fuel filter installed after pump and before the regulator. The odd thing is that I can't get the engine to ping no matter how much initial advance I throw in. No light, but I bet it was up around 30* of initial at one point. The starter could barely turn the engine over. The engine has about 1hr of run time on it, so I'm guessing some oil is still getting past the rings and preventing detonation : Timing changes made little or no impact on the driveability problem of not being able to get out of 3rd gear at WOT.

First thing I'll do is bump the fuel pressure. Run it, and do a plug reading. If anyone has any other ideas let me know.

Oh, anyone with rocker arms from RockerArm Specialists using a Clifford valve cover? We've got some serious clearance problems (using a stock cover for now).

I'll try and have some pics up soon. It's a very clean setup.

 

[Anonymous]

Could be a plugged up tank pickup.

 

[xctasy]

Plenty of information seams to indicate rope seals are grab points causing over heating and eratic running. Links in with very slow crank-over speed.Check Jimbo65's posts.


Best advice I can give is keep thrashing it, John!


Do check the fuel pump and basic jetting specs. Idle, main jets must sit above the 32/36 specs, and the float level, which is hard to check, must sit in spec. Anything here can cause problems.

Life running in worked six with non-factory bits is not that easy sometimes.


Does it cruise okay?

 

[CobraSix]

I agree with you, sounds like fuel. How does it go while cruising? If you are in 3rd not at WOT, how does it perform. If this is only happening at WOT, definitely sounds like a fuel starvation.

Slade

 

[falcon fanatic]

I agree. Now call me old fashioned, but maybe you should get a few more miles on that engine before flogging it like that.

 

[Anonymous]

I think your right on track with the fuel pressure and plug readings. Sounds like it's starving for fuel. I would bump the pressure up to 4.5 to 5psi.

I also agree with Falcon, 1 hour of runtime and your already kicking her in the ass!!!

LOL

 

[Anonymous]

I also agree with Falcon, 1 hour of runtime and your already kicking her in the ass!!! LOL

Just like it should be 8) Wimps.....

Anyhow, it cruises very well, even into 4th gear. If you step on the throttle in 3rd or 4th from a cruise it will start picking up speed, but again, after 5-10 seconds it begins surging badly.

 

[Anonymous]

you do have the float set correctly don't you? it could be it has enough gas put into it at the current float level, but whenever the RPMs increase not enough gas is able to get past the needle into the bowl.

 

[80broncoman]

unless it starts pinging I would forget the timing till you get the fuel figured out. if it is surging it is too lean. wheater it is is cruising or Wot.

 

[MustangSix]

If the fuel pressure regulator is working properly and the float level checks out, I'd check the lines, pump, filter, and pickup. You are running out of gas.

 

[Anonymous]

Hey Inliner,

did you get it fixed?

DB

 

[Anonymous]

Yessir! Pics, and better description in a few.