Forum: C4 ZR-1 General Postings
6 Days Ago
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Replies: 1
Views: 117
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Forum: C4 ZR-1 Technical Postings
2 Weeks Ago
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Replies: 5
Views: 176
Re: Front Crank Seal
From Huntsville, AL, the closest professional shop for C4 ZR-1/LT5 service is in New Concord, KY. 233 miles ve 482.
Graham Behan, Lotus Engineer. 260-701-8860
Assigned to on-site at Mercury...
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Forum: C4 ZR-1 General Postings
2 Weeks Ago
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Replies: 44
Views: 8,698
Re: Membership Renewal
I have a fair amount of experience, shipping ZR-1 LT5 parts now for about 16 years. I read you post and was totally in awe of your accomplishment...... 768 orders pulled, packed & shipped...... in...
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Forum: C4 ZR-1 General Postings
3 Weeks Ago
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Replies: 11
Views: 297
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 12
Views: 375
Re: Oil leak
That could be. I was going under the premise you were working on a stock engine. The more information, the better the diagnosis.
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 12
Views: 375
Re: Oil leak
That would be unusual for sure.
There are two sources of leaks in that area, which are common.
1. Oil Pressure Switch. See the left side of the following photo. Remove the wiring connector &...
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Forum: C4 ZR-1 Technical Postings
4 Weeks Ago
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Replies: 27
Views: 1,074
Re: Stranded on a road trip, '90 ZR-1, no crank
What is the rpm at which it would stay running and below which it would die?
When it stayed running, was it running smooth?
Did it run very rough right before it died?
Check your battery...
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Forum: C4 ZR-1 General Postings
4 Weeks Ago
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Replies: 8
Views: 396
Re: Trust the seat of your pants
Charlie,
I had the same problem. Two different recommended, "supposedly good" alignment shops. Car was just not right. I put the ZR-1 up on my 4 post lift & used a couple of good, straight 2x4's...
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Forum: C4 ZR-1 Technical Postings
03-09-2024
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Replies: 12
Views: 375
Re: Oil leak
If it's coming from above the crank sensor, it may be the center exhaust manifold stud. If oil in that area, remove stud, clean & apply hi-temp silicone to threads, reinstall.
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Forum: C4 ZR-1 Technical Postings
02-28-2024
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Replies: 15
Views: 543
Re: Heater hose return fitting replacement
Try to remove the remaining bit still in the housing.
I have resolved problems like this by using a hacksaw blade to cut into the remaining band 2 or 3 places around. Then using a small chisel or...
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Forum: C4 ZR-1 Technical Postings
02-15-2024
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Replies: 4
Views: 382
Re: Timing chain popping after timing procedure
Normal occurance after timing cams AND after removing the manual chain tensioners.
As you rotate the cams via crankshaft, there comes a point where camshafts don't have very much tension from...
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Forum: C4 ZR-1 Technical Postings
02-02-2024
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Replies: 14
Views: 1,467
Re: Horsepower difference ?
Matt,
I don't think it's a common issue at all. As I understand catalyst reversion, it may occur when the engine is operating @ high rpm, throttle is closed and clutch is engaged. Think in terms of...
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Forum: C4 ZR-1 Technical Postings
01-29-2024
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Replies: 14
Views: 1,467
Re: Horsepower difference ?
For sure! This ring isn't broken. The lands have been completely eroded away. The cylinder liner was toast & piston badly scored. I just don't have photos of the other components. The damage wasn't...
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Forum: C4 ZR-1 Technical Postings
01-23-2024
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Replies: 14
Views: 1,467
Re: Horsepower difference ?
That's because...... IF & When it does......... it Really is!
Referred to as catalyst reversion. Occurs during engine de-celleration, i.e. lifting throttle with clutch engaged at high rpm.
All...
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Forum: C4 ZR-1s and ZR-1 Parts For Sale/Wanted
01-07-2024
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Replies: 14
Views: 1,627
Re: Mecum - LT5 engines
2 of them are NOT new engines
Lot U97.6 is NOT a 1993 engine, tested @ MM Aug 20, 1992, probably 1992 engine
Lot U97.4 is NOT a 1993 engine, tested @ MM Oct 24, 1990, probably 1991 engine
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Forum: C4 ZR-1 Technical Postings
12-21-2023
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Replies: 7
Views: 1,371
Re: Fuel leak somewhere
1990 Model the purge solenoid is not under the plenum.
I am not sure exactly where it is but I think it may be on the front of the driver-side wheel well. Hopefully, someone with better...
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Forum: C4 ZR-1 Technical Postings
12-21-2023
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Replies: 7
Views: 1,371
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Forum: C4 ZR-1s and ZR-1 Parts For Sale/Wanted
10-28-2023
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Replies: 4
Views: 2,005
Re: 1993 Ruby 40th ZR-1 for sale
This is what I have on your Ruby in my 93 40th Ruby database.
1G1YZ23J3P5800385 USA UT (ship to state)
34,069 current mileage 28-Oct-23
Following is carfax data
Unk Owner, UT, 46 miles,...
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Forum: C4 ZR-1 Technical Postings
09-09-2023
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Replies: 12
Views: 2,897
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Forum: C4 ZR-1 Technical Postings
09-08-2023
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Replies: 12
Views: 2,897
Re: Limits of stock LT5 with boost?
Any build for more than 5psi boost is going to mean different rods & pistons.
More displacement means a new crankshaft.
You might find it simpler to just say how much money you have to spend...
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Forum: C4 ZR-1 Technical Postings
09-07-2023
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Replies: 12
Views: 2,897
Re: Limits of stock LT5 with boost?
Agree with Crabs.
Head Gaskets have been the first point of failure. The most resistant head gasket would be the Cometic MLS. Lingenfelter machined receiver grooves in the cylinder head, for the...
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Forum: C4 ZR-1 General Postings
07-09-2023
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Replies: 2
Views: 716
Re: I'm the worst and Jerry is the best....
Gosh J! You are being waaaay too hard on yourself. It's not a big deal. You have been a great customer & supporter of Jerrys Gaskets for over 8 years now. There have been difficult times between...
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Forum: C4 ZR-1 Technical Postings
06-11-2023
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Replies: 6
Views: 1,005
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Forum: C4 ZR-1 General Postings
06-11-2023
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Replies: 78
Views: 8,846
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Forum: C4 ZR-1 General Postings
05-28-2023
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Replies: 10
Views: 1,123
Re: LT5 in Chevy Hardcore magazine
Thank you, for sharing your build with us. Considering the LT5 is known as the "Heart of the Beast", a transplant is the perfect cure for what ails. Well done!!
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