3800 Supercharged Astre

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Re: 3800 Supercharged Astre

Postby vegastre » Sat Dec 02, 2017 12:37 am

Zoom, Zoom ,Zoom

It runs! It whines! It makes noise!..Step right up folks...for one thin dime, one tenth of a dollar see little Egypt do her famous dance of the Pyramids.

It's loud, rough edged, and crude but as promised a video of the "running" Supercharged 3800 Astre. First, you will hear the TB sucking air and no muffler system on the car and what you hear next are the Headers dumping on the ground. The fascinating part for me is the twin serpentine belt setup with eight pulleys all in tandem spinning doing their job superbly. A real show for not much money. Next you will notice the very pervasive whine of the Supercharger even with no mufflers. I gave it just a small rev but I think at that you could feel this V6 has performance potentials. Lastly, let me mention the engine bay, etc. is just in start-up mode and no attention has been paid to cosmetics, details and such. Enjoy

https://www.youtube.com/watch?v=Yj76BgYsZ6g
Phil Kennedy~
72 Chevrolet Vega GT Hatchback
75 Pontiac Astre SJ Safari Wagon
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Re: 3800 Supercharged Astre

Postby johnk » Sat Dec 02, 2017 10:43 pm

Well it runs :th: First time Iv'e seen a S/C 3800 in a H body and it looks like it could have come from Chev :) That intake was a pain I bet and you will hear it loud inside the car when you have it boosting. I noticed it looks like you still have the original coolant elbows that are plastic :oops: very prone to leak with age. That also means that you may have the original lower intake gaskets that are prone to leak. GM in 2000 or so started using metal gaskets because of failures. and the metal elbows are in the HELP section of most auto stores. There was a lot of work getting that to fit and you did a great job. looking forward to seeing you get it on the road. Please keep posting :wink:
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Re: 3800 Supercharged Astre

Postby zeke » Sat Dec 02, 2017 10:55 pm

I got noises too but it's a step forward! Congrats eh :th:
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Re: 3800 Supercharged Astre

Postby vegastre » Sun Dec 03, 2017 11:53 am

john,
Oddly enough the one design principal that pleases me the most is simply that the Supercharger fits under the hood. The fascinating part is the hood with its raised bubble design is the exact clearance needed.. The motor and SC would have never fit without this famous hood design for the Vega.

Ya, I did read up on the pitfalls of this motor and what you see is the aluminum elbows. Yep, I did use the metal sandwich intake gaskets (Very Expensive) I'm still trying to figure out why GM went with plastic gaskets in the first place.

Ya, the Throttle body makes a lot of noise with the present design. So, I will be designing a whole new enclosure which will seal the TB to the engine compartment and at the Same time give my back most of my space under the dash.
Phil Kennedy~
72 Chevrolet Vega GT Hatchback
75 Pontiac Astre SJ Safari Wagon
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Re: 3800 Supercharged Astre

Postby vegastre » Sun Dec 03, 2017 11:57 am

Ya Zeke,
I hear you...baby steps, baby steps but at this point I want giant leaps :th:
Phil Kennedy~
72 Chevrolet Vega GT Hatchback
75 Pontiac Astre SJ Safari Wagon
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Re: 3800 Supercharged Astre

Postby vegastre » Thu Dec 07, 2017 3:17 am

Ramble on...

Well,
46 for a high today and wintery snow/ sleet mix projected overnight. Not to worry, this is Texas and it will warm back up by Saturday hopefully. Just sitting here mulling over my time table for getting the SJ/SC off the dirt. Just to give a little insight into the future of the shade tree is once the SJ/SC comes off the dirt my 1972 GT Vega will take the SJ place under the shade tree almost immediately. In the early build stages of the SJ/SC project the 72 was used for mock up of the 3800 and featured in this project build.

The 1972 GT is a little worse for wear. I have owned this car since 1979 and has had a ragged journey. As my salute to just how marvelous, durable and infamous these early cars were I have decided to put the GT back to factory stock. Disclaimer here: Not purely stock because I don't wish to repeat the days of old. I will stay within the early Chevy Vega parts domain NOS and rebuilt parts as close to the original car that I remember because this car never came with a build sheet that I could find. This Z29 GT came with of course the infamous aluminum block steel head Four. It was delivered to Stakley Bros. Chevrolet in Dallas with the most basic ABS GT interior you could order, 4-Speed, Posi, no AC and few options which makes my job fairly straight forward with the restore. The original owner drove it until 1977 when it was parked because of a bad motor. He traded it in 1979 on a new car and I bought the car for $300.

The SJ will still get 90% of my attention but I need to get the 72 here under the shade tree and create a game plan for it. It has sat in the back yard of a buddy's house for the last fifteen years under a lean-too. Well covered from the elements and not a spec of deep rust on it other than surface rust. I will make it over there and do a video of the car which will include a shot of the vin cap (Tag).
Phil Kennedy~
72 Chevrolet Vega GT Hatchback
75 Pontiac Astre SJ Safari Wagon
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