Secret Monza GT Prototype discovered!

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Re: Secret Monza GT Prototype discovered!

Postby res0o7eb » Thu Mar 03, 2011 12:12 pm

I didn't realize that the engine in your prototype was a 60˚ V-6 - http://en.wikipedia.org/wiki/GM_High_Value_engine
Nice work - looks factory from the one pic. Any more pics?
Perhaps when your secret Monza GT Prototype was in the planning stages, the choice for the engine was inspired by this post on h-body.org ?
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Re: Secret Monza GT Prototype discovered!

Postby spencerforhire » Thu Mar 03, 2011 7:29 pm

I'm not trying to burst your bubble, but as far as I know a 90-94 3.1 Cavalier has a 24 tooth reluctor wheel on the crank and the much newer 3500 should have 57 teeth. If this is true, it would never run.
The "fleet"-
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
06 Silverado 2WD ex.cab daily
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06 GMC Canyon Shop truck
07 Colorado project( 5.3 4L60e swap)
99 Saturn SL1- wife's car
01 Saturn SC2- son's project
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and 4 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

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Re: Secret Monza GT Prototype discovered!

Postby Fastmax32168 » Thu Mar 03, 2011 9:59 pm

spencerforhire wrote:I'm not trying to burst your bubble, but as far as I know a 90-94 3.1 Cavalier has a 24 tooth reluctor wheel on the crank and the much newer 3500 should have 57 teeth. If this is true, it would never run.


Oh ye of little faith.....
http://mpracing.org/store/index.php?_a= ... ductId=530
Roy
80 Monza Cabriolet coupe
94 Corvette Convertible LT-1 500+ HP
Trailblazer EXT LS6 powered
1991 K1500 6.0 LS swapped
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Re: Secret Monza GT Prototype discovered!

Postby bill1978v8 » Fri Mar 04, 2011 12:24 am

I'll be looking for one to put in my 86 celebrity. Cool swap!
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Re: Secret Monza GT Prototype discovered!

Postby ColinOpseth » Fri Mar 04, 2011 1:31 am

spencerforhire wrote:pesky OBD2(96-up) necessity of a rear O2 sensor after the cat. If you go with an aftermarket programmer for the computer, the cat and sensor can be eliminated.
Here's a pic of an odd place to find one of these V6's- an Opel GT!


o2 sim solves that in about 5 minutes. Clip and ziptie out of the way.
'72 Vega with '93 Camaro LT1/M29 T56/12 bolt 3.31. 16" IROCs all around. Sanderson headers into duals with an H-pipe and Flowmasters. It's loud but at least it's faster than your grandma's Buick. pwned.
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Re: Secret Monza GT Prototype discovered!

Postby spencerforhire » Fri Mar 04, 2011 6:49 am

For once, I'm happy to be wrong! I've worked with external crank triggers on drag car ignitions and I was aware they were available for LS motors, but I didn't know there was that much aftermarket support for 3500 swaps. Please keep us informed as your swap progresses.
The "fleet"-
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
06 Silverado 2WD ex.cab daily
03 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
06 GMC Canyon Shop truck
07 Colorado project( 5.3 4L60e swap)
99 Saturn SL1- wife's car
01 Saturn SC2- son's project
07 Saturn Ion Redline project
and 4 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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Re: Secret Monza GT Prototype discovered!

Postby monzabug350 » Mon Mar 14, 2011 1:32 pm

WOW! That color is the same color I have planed for my Monza,or mine is a very close match! Takes the guess work out of wondering what it will look like.And you do have one find looking car!
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Re: Secret Monza GT Prototype discovered!

Postby DrCAS » Mon Mar 14, 2011 10:40 pm

Damn! Hotrodding at it's best! YEAH!
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The 3500 is in!

Postby Fastmax32168 » Sun Nov 13, 2011 7:26 pm

This turned out to be tougher job than it looked like at first glance. Even though the motor is very narrow and short and looks tiny on the stand, the narrow vee causes it to be much taller than a traditional 90 degree motor. I had a heck of a time getting it positioned so that it cleared the firewall in the back and cleared the centerlink on the front. There were a few times I ran into an obstacle that I thought was going to stop the whole project cold!
Before I put the motor in I tore it down and did a few modifications. Extensive porting was done to the heads, lower intake manifold and upper intake manifold. That was followed up with a good 3 angle valve job.
I ended up pulling the crank and changing the internal reluctor wheel rather than "adding" one onto the front so that I could run the motor on OBD1 technology. The little motor was in great shape inside with only 28000 miles on it.
Hard to believe I bought it for $180 at the salvage yard. The law of supply and demand at work. :D
Here is the motor on the stand. Check out the factory roller rockers and canted valves. I should have taken a pic into the port so you could see the straight shot into the intake valve
Image
Here you can see how the oilpan is a structural part of the engine. It is a thick cast aluminum piece and the bolts on the side go straight into the main bearing caps. Inside of it I found a steel crank and cracked PM LS style rods.
Also in this pic you can see how I had to remove the front wheel drive motor mount off of the front of the oil pan.
Image
The 60 degree pulley system I found to work best in the Monza was off of a 3.1 in an 88 camaro. In order to convert the motor to work in a RWD application you have to steal everything from the timing cover forward. None of this is a bolt in but it wasnt too difficult to adapt. A hole needs plugged in the timing cover, Some of the holes in the block need inserts installed in order to accept smaller studs, and the holes in the head are in different locations and need some adapting. In this pic everything is on except for the PS pump. The factory camaro style will not work as it hits the steering box. I bought one with a remote reservoir and am waiting until the motor is in the car before final positioning of it. That big throttle body is off of an Olds Aurora. The 3500 throttle body is fly by wire and will not work for you. I made an adapter in order to install it but the adapters are available commercially. Another piece we fabricated is that water neck you see. Again, if you are not fortunate enough to have access to your own CNC machine, these can be bought on the web.
Image
80 Monza Cabriolet coupe
94 Corvette Convertible LT-1 500+ HP
Trailblazer EXT LS6 powered
1991 K1500 6.0 LS swapped
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Re: Secret Monza GT Prototype discovered!

Postby Fastmax32168 » Sun Nov 13, 2011 7:45 pm

For engine mounts I used the factory 4 cyl mount adapters and simply welded a flat plate to them. Then I fabbed up a few brackets using existing mount bolt holes that are on the side of the 3500 block and connected them using old school 70s vintage chevy small block style mounts
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On the drivers side next to the master cylinder you can see how the firewall has been "flattened for the left head to clear. This motor sits way back in the chassis. You also have to move the throttle cable entry point up from where the factory put it.
I decided to go with a "flat" version of the outside color to stick with the modernizing theme.
Image
I mounted the computer inside above the glovebox and brought the wiring out here.
Image
80 Monza Cabriolet coupe
94 Corvette Convertible LT-1 500+ HP
Trailblazer EXT LS6 powered
1991 K1500 6.0 LS swapped
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Re: Secret Monza GT Prototype discovered!

Postby Fastmax32168 » Sun Nov 13, 2011 7:55 pm

The 700R4 is one big mutha. the entire factory crossmember mount has to be cut away and a new one fabbed up. Even then it is very tight in the tunnel.
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Success! The little headers you see are for putting one of these into an MG but work perfectly in this application.
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Can anybody say "radiator clearance"? This motor weighs less than the Iron duke and look how far back it sits. I think the car may out handle my vette by the time I am done. :mrgreen:
Image
80 Monza Cabriolet coupe
94 Corvette Convertible LT-1 500+ HP
Trailblazer EXT LS6 powered
1991 K1500 6.0 LS swapped
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Re: Secret Monza GT Prototype discovered!

Postby Fastmax32168 » Sun Nov 13, 2011 7:59 pm

Just a few wires left to hook up. :bang:
Image
I cant wait to get this finished. I fully expect this car to get over 30 MPG on the highway, lay down close to 250 HP, and have excellent front/rear balance.
Here is a shameless plug for British Car Conversions who can supply most of the parts you need if anybody else wants to make this happen. Check out the video under the 3900 MGB swap tab.
http://www.britishcarconversions.com/

Roy
80 Monza Cabriolet coupe
94 Corvette Convertible LT-1 500+ HP
Trailblazer EXT LS6 powered
1991 K1500 6.0 LS swapped
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Re: Secret Monza GT Prototype discovered!

Postby vegavairbob » Mon Nov 14, 2011 7:55 am

Very nice rendition of a GT Monza.
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1973 Chevrolet Vega GT - Millionth Vega
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Re: Secret Monza GT Prototype discovered!

Postby Kenova » Mon Dec 05, 2011 6:10 pm

Can we have an up-date Roy? :th:

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My other car is a Nova.
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Re: Secret Monza GT Prototype discovered!

Postby Sunula66 » Sat Dec 10, 2011 10:24 am

This is such an interesting build! The tranny is bigger than the motor, well almost, and as I was reading, I was curious as to the mods needed to fit that "mutha" into position without tubbing the tranny tunnel at all?! Because of engine positioning does this allow the hammer to stay safely on the bench? (Freddo, keep away from the hammer!) The size of the torque convertor housing should need to be accomodated, no? and what about the drive shaft and torque painintheass-arm? Please update us as soon as you can, very nice job indeed!
( just wonderin' if you need skin graphs on yer knuckles yet? :shock: :lol: )
I'm with Bryan on the two lite system!
What are the rims and the tire size used? :th:
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