Quad 4 swap (lot of pics) (Page 10/31)
sardonyx247 JUL 17, 04:32 PM
The oil pan painted.






The block painted, it shines back the camera flash off the wet paint.






Without the flash.
Quad Raider JUL 17, 04:34 PM
Looks great. What kind of paint are you using?
sardonyx247 JUL 17, 04:52 PM
Rust-oleum 500deg engine paint, gloss black.
Fierobsessed JUL 17, 05:25 PM
The polyurethane insert was part of a Fierostore dogbone re-bush kit.

The thermostat housing was a normal Fiero 4 cylinder piece. I cut off the flange where it bolts to the head, and made one that matched the quad 4's head, then welded it on. I also cut off the outlet and welded in an extension using parts from another quad's water return tube. I also welded a bung to the bottom and screwed in the quad 4's heater core outlet. This was VERY important! because the quad 4's heater core outlet has a 1/4" (ish) restrictor inside it. The engine is so rev happy that it tends to over-pressure the heater core. I blew my first heater core, then made that little change.

I'm not sure, but I think I may have cut off the neck itself and re-clocked it and welded it back on. I don't remember if I did that or not. It was 8 or 9 years ago that I did it, so my memory is a little rusty about the details.
Quad Raider JUL 17, 05:32 PM
Cool. Doesn't the Quad's t-stat housing have two fittings, one for temp sensor and one for fan switch? Does the duke's have the same two?

And while I'm pelting you with questions, how did you solve the clutch slave cylinder issue? Looks like you made an adapter plate to use the Fiero slave cylinder, instead of using the Quad/Getrag slave with an adapter fitting, right?

[This message has been edited by Quad Raider (edited 07-17-2012).]

Fierobsessed JUL 17, 08:01 PM
The quad 4, and all gm enines using a "P4" style ECM do not have a fan switch. It uses the Coolant Temperature Sensor, which reports actual coolant temperature to the ECM which then controls a relay that runs the fan based on programmed set points. There is one more temperature sensor, and it is only used to operate the temp gage and light on the dash. That sensor is in the head right next to the thermostat housing. The duke did have an additional sensor for the fan.

As for the slave... The original slave cylinder was a large plastic one. No matter what i did, I could not get enough stroke out of that slave to get the clutch to release. It was either due to the fact that the slave cannot be bled, or just that it was too large a diameter for the master to actuate. I made an adaptor that will use a standard fiero getrag slave. But, then the stroke turned out to be a bit on the long side, and the clutch pedal is very hard and touchy, but still totally drivable. Rodney Dickman does sell an adaptor that does this same thing. Should probably be used with a pedal limiter, or an adjustable banjo, which rodney also sells.

[This message has been edited by Fierobsessed (edited 07-17-2012).]

Fierobsessed JUL 17, 11:50 PM
Actually, I forgot that I put the sensor in the head as opposed to the water neck. So you are right about the two sensors in the water neck. I swapped the sensor for the heater core outlet I think...
sardonyx247 JUL 18, 12:58 AM
The adjustable banjo he sells will not work as a pedal limiter, his will only make the pedal longer to be a band aid fix for other problems with a clutch system. IE: a garbage product. I will cut down and rethread my own banjo.

And yes there is one sensor in the custom neck and one in the head, the stock stat outlet has a throttle body feed with the two sensors inline with that. Without the need or want of TB coolent flow, what Fierobsessed did will work just fine. and for the ECM controled fan the 87 duke fan is allready ECM controlled, so no problem there.
Quad Raider JUL 18, 09:44 AM
I remembered that I just happen to have examples of both engines sitting in my shop, so I took a couple photos:



This Quad is a spare non-HO I bought at a salvage a couple months ago. It still has the throttle body coolant lines attached. I removed them on the HO in my GTZ daily driver years ago. I never noticed the restriction on the Quad's heater hose fitting, so thanks for the tip about that.

[This message has been edited by Quad Raider (edited 07-18-2012).]

sardonyx247 JUL 22, 06:27 AM
I haven't done much on the quad lately, I have been playing with my new brake booster equiment

I did get back to it today, and did some work on the head.
The surface needed cleaning bad, the old gasket was stuck on pretty good.






It took awhile being an aluminum head I didn't want to scratch it, so I had to figure out what would work and not scratch it.
I used rubbing alcohol and a scothbrite pad, and ALOT of elbow grease later, it came out pretty clean.