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Discussion Starter · #1 ·
OK so I just dropped in a engine with 55k on it pretty clean with new injectors and new clutch. Drove it around a week or so to get a feel for it. Then swapped out the fuel pressure regulator (set to 44 psi) the put in the custom roller rockers on. Now I’ve got terrible low end and power loss...

It was hard for me to time my ignition (via the distributor), when it was dead on the engine sounded like crap. When I went with sound it was like 20 degrees BTDC. WTF? (the crank and cam are in perfect alignment with the timing belt and yes the distributor is on correctly.

You guys think the rockers are not the lift they are supposed to be, throwing off the valve train geometry? Is it possible Harland Sharp is selling the original basic escort lifter/valve lift and not the HO on these rockers? Or have I gone mad or is something else going on?

I'm thinking of swapping the stamped rockers back on and testing the results.
 

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There is no difference between HO or base model rockers, it was the valve geometry that made the ratio difference.

I'd say check your regulator to see if it's supplying the proper amount of fuel, and changes properly to suit the engine. Also, how are you timing the distro? Did you disconnect the ECU controller shunt (gray or black connector near the TFI) before timing? If not, then that's your issue.
 

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Discussion Starter · #3 ·
Cow their is a lift difference between the base and the HO rockers, the lift for the base is 1.60, HO is 1.68. I installed a fuel pressure gauge tho the Schrader valve, it is dead on 44 psi and 39 psi at idol. I timed my distributor with a timing light.

I have to admit my ignorance tho I have no idea what/where the ECU controller shunt is, or what it does (not sure the GT has one). Can you help me with this one cow?

Think I should run more than 44 psi on the regulator?
 

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Discussion Starter · #5 ·
UnexplodedCow said:
There is a lift difference for the valve, but the rockers are identical.
Awesome. So that explains a few things, thanks.

Any more ideas as to my pep low end power problem or info on the ECU controller shunt you were talking about?
 

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Well, to time the engine the ECU can't control the TFI module. That little shunt piece is for the ECU controlling the timing. Pull that out, and you're at base timing, which should be 10.

As for the low end grunt missing, check your valve timing, I'm betting you're about 3-4 degrees retarded.
 

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Cow's right on here. The position in the head is different in fact the valves lengths are different from the HO to the 2gen and CFI. 1.65 and 1.68 isn't that different but granted any less lift is unwanted.
 

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Discussion Starter · #8 ·
Old 86 or Cow can one of you guys tell me the length of the base and GT model escort valve lengths? And or the difference in the lengths?
(I have have the Ford factory manuals and the Hanes if that helps).

This could be of some importance as I talked to Mike today at Harland Sharp the rocker arm seats are made from the base model. Mike seems to think that the lifters at zero lash may not like the base model load/prepump height and that could lead to some performance loss.
 

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I doubt it's that as the lifters between GT and base models are the same. I'm at work and don't have the hard numbers with me (manuals are at home). It wasn't just the length, but the angle the valves are installed...not quite the same as the CFI heads.
 

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I don't know if I have this information anywhere on paper. I just remember taking a set of HO valves to my head guy and he told me that the valves were too short. At that point I asked him if we could just lower the valve seat deeper into the head and remove the extra material. This is when I found out the angle on the valve was different. The bigger HO valve would contact something but I don't recall what it was.

At any rate I have used rockers from a CFI head on my HO head with no issues. Question; is your lifters pumping up correctly? By mistake I put a 1.6 cam in a 1.9 head and about half the lifter would work correctly and the other half didn't. I messed around for a week before I figured it out. I always check the cam bore and cam journals.
 

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The HO valve might have a problem with the shrouded CFI comb. chamber. I'm thinking the HO valves may be more horizontal than the CFI valves, to improve airflow, which would result in a little change in rocker ratio, too.
 

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Discussion Starter · #12 ·
So I still can not find my power/responsive loss problem. :( -I'm starting to think it may be a bad fuel pump. I was looking over at autozone.com and it says the fuel pump is rated at 70-95 psi. Is this what I should be getting at the fuel rail instead of the 39 psi you guys and the hanes manual said.

But I did find this... From the roller rockers. :( -I'm kinda pissed.

 

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Correction....look at the roller rocker thread. 1Low posted up some pics of them mounted on his HO head when he got them. If you look closely you'll notice the same notched spots on all his rocker bosses.


Also, your fuel pressure is fine. The pump operates at a higher pressure (or can operate) but the regulator takes the pressure down to 39 for the injectors. The CFI pump runs about 45 psi, which is taken down to 14.7 at the injector...big injector, low pressure.
 

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Discussion Starter · #16 ·
UnexplodedCow said:
Correction....look at the roller rocker thread. 1Low posted up some pics of them mounted on his HO head when he got them. If you look closely you'll notice the same notched spots on all his rocker bosses.
Correction...Correction... ;) I assure you that their is excessive wear to the bosses. True that the stock head has small groves, but the roller rockers did cause some damage (I have a spare head to my GT and to double checked I just popped it open).

Thanks Cow for the info on the fuel pump psi, that makes good logic.

--Photo update...

 

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Is there any wear on the rocker, though? I'm guessing the anodizing would wear off it if the head wore that badly....or else they weren't torqued properly? I'm just going at this as logically as possible. Oh, maybe some measurements of the damage (diameter and depth of the crater) would help.
 

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Discussion Starter · #18 ·
So I talked to Mike at Harland sharp. The best we can figure is that the rocker seats may have spun when I torque them down. IDK? I know I put those dang things in correctly and did the zero lash (20 lbs) plus a full turn, (only likes 1/2 so stopped there).

I'm gonna put them back in and see what happens I ques... :scratch:
 
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