Aurora 4.0l / Izuzu 5 speed swap into 88 coupe (Page 92/102)
cptsnoopy SEP 12, 06:48 PM
that's the issue. I decided to use the v-5 compressor because the car is already wired for it and the v-5 is fatter than the stock caddy compressor. I would have to do a bit more work to swap the a/c system to a compressor cycling model.

Charlie
cptsnoopy SEP 14, 02:55 AM
It's confirmed, the intake cam on the Shelby L47 is the same part number as the intake cam on the L37.
The sprockets appear to be stock which makes me wonder if the intake/exhaust cam timing isn't identical to the L37?
Edit to add: I found more info that supports the idea that Shelby simply put L37 cams in their series one engines with no other changes. The cam timing is identical to the L37.
I have the odd (RH) bank cams removed and will attempt swapping in the stronger springs tomorrow.

Charlie

[This message has been edited by cptsnoopy (edited 09-14-2014).]

Will SEP 16, 09:09 AM
Where are you getting the advertised cam timing numbers for the Shelby?

Where are you reading the part numbers?

I'm curious about this, as what I've heard is that the Shelby intakes used the L37 lobes ground 5 degrees advanced... they would use the same sprockets as everything else. I'd want to check with a degree wheel, but I know that's a PITA.
cptsnoopy SEP 16, 04:32 PM
I tried finding the document that listed the cam specs for the 4 engines. The L37, LD8, L47 and the "Shelby" version of the L47

The cam specs including timing numbers were exactly the same for the L37 & the "Shelby" version of the L47, both intake and exhaust.

The cam specs including the timing numbers were exactly the same for the LD8 and the L47.

There was a change in I believe the L47 from 98 to 99 and the cam timing changed one degree. If I could find the doc, I would post it here. Anyway, I think the 5 degree advance probably comes from the LD8/L47 intake advance of 9 degrees BTDC to the "Shelby" version of the L47 being at 13 degrees BTDC. I know that's only 4 degrees but in the doc I read, the change of one degree either made it 4 or 5 degrees different. In my GM training manual, the L37 cam specs matched exactly to what the doc showed and they were identical to the specs listed for the intake on the "Shelby" version of the L47. Then I talked to a guy that was around when they were making the changes to the L47 for the Shelby and he said that he agrees that the only real change was to pull the stock intake cams and replace them with the stock L37 intake cams. There was no cam timing changes other than what came with the cams.

Here are pics of the cams in my engine.

Charlie


Right Head


Left Head


Cam part numbers in no particular order
















Stronger valve spring on the left, stock on the right.
cptsnoopy SEP 16, 09:27 PM
Found the info, cannot guaranty accuracy but it jives with everything I have heard or read that seems plausible.

Just for kicks, Isn't the L37 intake cam actually 7 degrees retarded compared to the LD8 intake cam?

Charlie



Olds cam specs
1995 - 1999 Cadillac (L47 (VIN C )
• Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 9 degrees BTDC
• Intake Closes 55 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift
• Intake 8.6 mm 0.339 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 244 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 22 degrees

Shelby Series I

Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 13 degrees BTDC
• Intake Closes 73 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift
• Intake 9.4 mm 0.370 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 266 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 26 degrees

Cadillac specs


1993 - 1998 Cadillac (LD8 (VIN Y )
• Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 9 degrees BTDC
• Intake Closes 55 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift
• Intake 8.6 mm 0.339 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 244 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 22 degrees

.

1993 - 1999 Cadillac (L37 (VIN 9)
• Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 13 degrees BTDC
• Intake Closes 73 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift
• Intake 9.4 mm 0.370 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 266 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 26 degrees

.

1999 Cadillac (LD8 (VIN Y )
• Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 8 degrees BTDC
• Intake Closes 55 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift• Intake 8.6 mm 0.339 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 243 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 22 degrees
cptsnoopy SEP 21, 08:09 AM
More parts showed up on Friday. The new alternator and the new computer.

After putting in 20 of the new springs last weekend, I stopped because the retainers just did not seem right. The spring is a bigger diameter and they were able to "float" around under the retainer an excess amount. chrfab.com sold me a set of new high-performance retainers and I got them on Thursday. So far I have been able to get 16 of them installed. Since the right side head now has the new springs and retainers, I will install the cams and check for spring binding but I don't expect any issues.

Charlie


More pics of the goodies!

New alt:


New spring with new retainer:




new computer:




It's just over 12" long and barely fits!



Armrest just fits...
cptsnoopy NOV 01, 11:43 PM
I still have no real idea why the engine started running weird and a thought came to me. Maybe the catalytic converter on the even bank got damaged when all the oil ran through it from the first engine. Since the car is not required to be smog legal, I decided to have a look. I opened the cat and pulled out the converter. It looked great. There was no indication of blockage. So I did the same to the odd bank cat and it was the same. They were not the problem. I decided then that if I did no actually need to have them installed that I would leave the converters out and rid the engine bay of the heat they produce. I did not want to leave the cans simply gutted and there was not enough room to install any available mufflers so I made my own "glass packs" using the cat housings and some perforated tubing from an opened up new glass pack muffler. I had read somewhere that the higher end straight thru mufflers use stainless steel wool instead of or in addition to fiberglass to help attenuate the noise. I found some at home depot and below are the pics of the cats being converted to mufflers. I am hoping to at least achieve the same or more noise attenuation as the cats themselves. The car was just a tad too loud for my liking.

Charlie
cptsnoopy APR 09, 03:59 PM
Life got in the way for several months but finally getting back to the "project".
Currently working on the wiring again as I had to pull it all apart to separate the 950 wires from the stock wires. Taking a hint from Russ544, I'm keeping the 2 harnesses separate this time.

If all goes as planned I should be test firing by the 18th if not sooner.

Charlie
Will APR 09, 06:49 PM

quote
Originally posted by cptsnoopy:

Found the info, cannot guaranty accuracy but it jives with everything I have heard or read that seems plausible.

Just for kicks, Isn't the L37 intake cam actually 7 degrees retarded compared to the LD8 intake cam?

Shelby Series I

Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 13 degrees BTDC
• Intake Closes 73 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift
• Intake 9.4 mm 0.370 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 266 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 26 degrees


1993 - 1999 Cadillac (L37 (VIN 9)
• Valve Timing (With Ramp at 0.100 mm Lift)
• Intake Opens 13 degrees BTDC
• Intake Closes 73 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC

• Valve Lift
• Intake 9.4 mm 0.370 in
• Exhaust 8.6 mm 0.339 in

• Duration (@ 0.100 mm Lift)
• Intake 266 degrees
• Exhaust 244 degrees

• Valve Overlap (@ 0.100 mm Lift) 26 degrees




What I'd heard elsewhere through the grapevine was that the Shelby cams were the same as the L37 Caddy cams--which your data agrees with--but with the intakes ground 5 degrees advanced, which your data does not agree with.

Where did you get your info about the Shelby specs?

Also, the 266 lobe used in the L37 and Shelby intakes (obviously) has 22 degrees more duration than the 244 lobe used in the LD8 and Aurora engines. In order to maintain a valve overlap period which won't fail emissions, GM has to retard the intake lobe center for the long duration cam when used with the same 244 degree exhaust cam.

EDIT:

I forgot you'd posted so much info on the cams previously. I have a set of L37 cams on the shelf and I can compare part numbers next time I'm at my dad's house.

[This message has been edited by Will (edited 04-09-2015).]

cptsnoopy APR 11, 01:04 AM
They should be the same. When I look up the part numbers for the L-37 they are the same numbers.

I decided to carefully check for continuity on each of the wires in the custom wire harness I had made for me. Good thing as I found that the solder joints were not up to snuff. They just needed a squirt of liquid flux, reheating and a little more solder to make good joints. Bummer is that it took all week to remove the harness get the solder joints fixed and now I am back to where I was last Monday. Happy that I found what would have been a nightmare of an issue to troubleshoot but bummed that I am not already rolling the engine back under the car. I might get lucky and have it in by the 18th still but no guarantees with the limited time left...

Charlie