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  #556  
Old April 28th, 2019, 22:43
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Re: Project Unicorn - a light duty trail rig

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Well, the good news is GLOM is fine.

.
I'm happy to hear it lives, I want to see you put some miles on this one!
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  #557  
Old April 29th, 2019, 22:20
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Re: Project Unicorn - a light duty trail rig

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I'm maybe a little less bothered by engine failure than you are.
Plus. You know. You're used to it.

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Us normal people...
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  #558  
Old April 30th, 2019, 08:16
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Re: Project Unicorn - a light duty trail rig

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Plus. You know. You're used to it.

you may not know this, but you're kind of a jerk.
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  #559  
Old April 30th, 2019, 08:23
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Re: Project Unicorn - a light duty trail rig

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you may not know this, but you're kind of a jerk.
A jerk that needs to fix his jeeps.
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  #560  
Old April 30th, 2019, 11:14
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Re: Project Unicorn - a light duty trail rig

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A jerk that needs to fix his jeeps.

I need to stay in L.A. long enough to do that.
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  #561  
Old April 30th, 2019, 12:28
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Re: Project Unicorn - a light duty trail rig

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I need to stay in L.A. long enough to do that.
I will grant that it helps to be home.

My XJ is my daily driver, if I am home. Just yesterday I noticed I was down to about a quarter tank so I stopped and fueled it up. Pulled out my fuel log and saw that the last time I fueled it up was in mid-January.

Dang.

I am ready to be done with this particular season of life.
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  #562  
Old May 12th, 2019, 19:05
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Re: Project Unicorn - a light duty trail rig

Not a whole ton to update here.

When I did the genrite tank, my fill hose and vent were in really lousy condition. I changed those out Friday. Only took one picture of everything on the ground, the old hoses were filthy enough that I never wanted to touch my phone.

Gates 24710 1.5" fill hose and a 5/8" fuel hose for the vent.



Saturday I pulled the dash and changed out the heater core. Kind of a PITA job but not as bad as I was expecting.








Turned out I didn't quite have enough hands to get everything back in place with the dash in the way, Itscheesy came by to help me slam it all back together and then took it for a test drive.



I think he enjoyed it.



Today I filled the tank all the way for the first time since installing it. It takes ~9 gallons after the fuel gauge pegs on full. Did 180 miles up to Tholke's and back, 80 mph the whole way there and 65 all the way back, averaging 18.9 mpg. Not terrible, but I think a new torque converter may improve it some.
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  #563  
Old June 4th, 2019, 14:16
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Re: Project Unicorn - a light duty trail rig

Well, I'm still getting some pinging. Talked it over with Russ and we've decided to lower the compression ratio a bit.

Before pulling the engine for new pistons, we're going to try making adjustments to this one. Currently we're at 11.4:1 with .026" quench on a .043 head gasket. Going to pull it and try a .060 head gasket for 10.93:1 and .044 quench.

Also going to try out some new lifters while its apart.

Started out by calling up SC_Redneck and having him catch a flight out to visit.



We yanked the head off this engine like we're pull starting a lawnmower.





Noticed a couple of things here. Kind of an excess of carbon buildup for an engine with ~1K miles on it. And way too much JCR Handicorn.



This does not excite me. More on it later.



.... Project Unicorn you say?



The exhaust valves are pretty clean but the intake are just caked.



Went ahead and pulled the Comp lifters out (right) and replaced them with Johnson lifters (left). I've had some lifter noise since day 1, and it is becoming more common with the Comp lifters. Russ is looking at these as a replacement.





New Cometic .060 gasket.



Must be built for a TJ. Slight interference with the AC bracket, we just trimmed the gasket.



That's a lot of gasket. Would be an issue if if the pistons werent .016 out of the hole, but it may be a problem solver here. Time will tell.



The supervisor approves?



Head back on, rockers checked for proper preload (which amazingly was just fine).



5 spark plugs looked healthy, but Cylinder 6 has clearly been detonating.



Valve cover back on, and waiting for the new manifold gasket to arrive today.




We're pretty certain at this point the crappy baffles in the Crown valve cover are letting the engine suck oil, which is burning poorly and contributing to pinging. I'll be adding a catch can to the PCV and probably go back to a stock valve cover.
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  #564  
Old June 4th, 2019, 19:28
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Re: Project Unicorn - a light duty trail rig

I'm curious to see the outcome from the compression drop, my experience has been worse pinging because of quench increase....but my experience was not on a jeep....so??


Also, maybe this has been covered....but have you flowed your injectors? I have a fancy machine for it if you want me to check them out?
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  #565  
Old June 5th, 2019, 03:56
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Re: Project Unicorn - a light duty trail rig

Have not seen SC Redkneck in a while....
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  #566  
Old June 5th, 2019, 06:17
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Re: Project Unicorn - a light duty trail rig

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I'm curious to see the outcome from the compression drop, my experience has been worse pinging because of quench increase....but my experience was not on a jeep....so??
As a general rule, you are absolutely right. Russ believes that because this one was so tight to begin with, that we may get away with it. Our final quench will still be exactly half of what stock is.

Quote:
Originally Posted by JohnX View Post
Also, maybe this has been covered....but have you flowed your injectors? I have a fancy machine for it if you want me to check them out?
I have not. They are brand new 30 pound injectors from Five-O motorsports, so I didn't really feel the need, but I may take you up on that.
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  #567  
Old June 5th, 2019, 06:18
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Re: Project Unicorn - a light duty trail rig

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Have not seen SC Redkneck in a while....
Yeah he's Tennessee Redneck now, and its hard to get him out of his backwater village.
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  #568  
Old June 8th, 2019, 10:00
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Project Unicorn - a light duty trail rig

Ton of buildup on those pistons. Any idea what's causing it?

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  #569  
Old June 8th, 2019, 12:29
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Re: Project Unicorn - a light duty trail rig

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Ton of buildup on those pistons. Any idea what's causing it?
Are the 30-lb injectors too rich. Sure looks the way.
So much for custom tuning.
I'm running 27-lb injectors in my Russ stroker, with a lower compression ratio.
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  #570  
Old June 9th, 2019, 09:31
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Re: Project Unicorn - a light duty trail rig

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Originally Posted by lazyxj View Post
Are the 30-lb injectors too rich. Sure looks the way.
So much for custom tuning.
I'm running 27-lb injectors in my Russ stroker, with a lower compression ratio.
Don't knock the custom tuning. The name of the game that day was "try and tune out the pinging" and I documented it as such.

It was still pinging under some scenarios, which is why we're now trying a thicker head gasket.

A lot of theories on the buildup. Obvs it is rich under load (we knew that), and there are some interesting theories that overtight quench may be extinguishing burn in the quench zone (not sure I buy that one, russ sure doesn't).

I cleaned up as much of the buildup as I could, gonna put some miles on it and do a seafoam, and if I don't see immediate pinging, schedule another tuning session to see if we can dial it back without more pinging.

If it still pings after that, probably have to have a new set of pistons knocked up dropping the compression a bit more. Our original goal was 11:1, the 11.4 was an accident (I re-used the race car crank and didn't consider it was offset ground). It will be interesting to see what happens, about to go out for the first test drive now.
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