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Hi,
Thought this didnt seem right with them out of the engine....
Question is new rockers or replace internals...
The pivot cup to the pushrod is nice and shiny but not worn down to oiling hole or scored or anything.
Regards
gav
Do a BRONZE BUSHING (NOT needle bearing) trunnion upgrade. CHE probably has the best one. Easy install too, with everything slip-fit. Both sides of the bushing are oiled this way.
Do i have to change the valve guides in the head for PM instead of stock, dont really want to pull the heads though...
read somewhere if do trunnion upgrade then need to do this or have i my wires crossed...?
BTW thanks for any of this help.
regards gavin
Do i have to change the valve guides in the head for PM instead of stock, dont really want to pull the heads though...
read somewhere if do trunnion upgrade then need to do this or have i my wires crossed...?
BTW thanks for any of this help.
regards gavin
Bronze valve guides usually dictate roller-TIP rockers to prevent side-loading the valve and the guide wear that accompanies it. Trunnion type has no bearing (oh boy....) on this situation.
Ok,
Looks like need to do them. $200 ish...
Might as well get thicker pushrods and thinking pac 1219's as well as dont want to keep stock springs with the 224r cam.
Thanks.
Regards
Gav
Hi,
Was hoping i fixed the KR but no it seems.
I removed some steel in the trans tunnel and now is a decent gap between trans and trans tunnel where i thought it may be catching. Ran a log and no knock, increased back to 24 degrees and got knock again around 4000rpm 1.5deg kr.
Oh well looks like thats the max timing i can run around torque peak 22.5 to 23 degrees.
Increased timing upto 6400 rpm to 25/26 after peak torque.
Have my new Che kit arrived and the pac 1219 springs. Will install soon.
Thanks all anyway.
Regards
Gavin
Thinking about this, talking to myself lol, i have only filled the cobra on normal unleaded which is ron 95/93 in the uk. This is actually not the same as your states Ron, and from reading equates to 4 to 6 less so at best been filling with your equivalent 91 ron and at worst 87 ron...
Sounds like a good test to do and fill up on our 99 ron, your equivalent 93 ish.
Would this make a huge difference?
We dont have anything higher than 99, your 93 equivalent.
Regards
Gav
Thinking about this, talking to myself lol, i have only filled the cobra on normal unleaded which is ron 95/93 in the uk. This is actually not the same as your states Ron, and from reading equates to 4 to 6 less so at best been filling with your equivalent 91 ron and at worst 87 ron...
Sounds like a good test to do and fill up on our 99 ron, your equivalent 93 ish.
Would this make a huge difference?
We dont have anything higher than 99, your 93 equivalent.
Regards
Gav
Yes. Massive difference.
These cars aren’t meant to run on 87 ideally. That’s why there’s a low timing table in the tune for “bad gas.”
Not running 93 octane is probably your primary reason for knock.
YES on better fuel. Wasting your time on anything less than 92.
I did finally get my car on the dyno. But it's a way different animal than yours. So the timing curve will for sure be different.
But the basics are 25 degrees before torque peak, 20.5 degrees at torque peak, then I ramp it to 28degrees at 7000.
My fuel is 12.2 at torque peak, and I lean it to 12.7 at the high rpm.
I'm auto trans, pulls were done in 3rd gear converter locked.
I only made 5 pulls. Should have, could have done many more dialing it to perfection, but gee, with 100k on the clock, I don't want to bust it!
Dyno is a Dyno Dynamics. So it reads low.
I'll let you all discuss this vs a DynoJet result.
Old on right, new 1219 on left Old on right, new pac 1219 on left
Hi,
New springs pac 1219, CHE trunnion upgrade kit going in.
I did buy some new valve seals but bought the wrong ones as the ones that are in are 1 piece with the base shim and i just ordered the two piece seals, oh well....
Have done one bank and measured for pushrod on each one.
Crapped myself as was getting around 7.327 + - 0.010 and pushrods that are in are 7.396 to 7.401. Then on one cylinder exhaust i got 7.296 on adjustable pushrod checker....thought about it and rotated the engine a few turns by hand and re checked and it was back to 7.333.... guess the lifter was pumped up still with oil??
Another thing is the springs that have come out ( i dont know what they are but they are the same thickness steel 0.166" as the pac 1219s and look very similar...anyone any insight, i.e. do they look like stock??
Another bank to do yet.
Regards
Gav
08-29-2019, 10:36 AM
