Vortech supercharger
Racer
Joined: Jul 2003
Posts: 304
Likes: 0
From: Corinth Tx
Re: Vortech supercharger (madvette74)
simply put the more comp you have the less boost you can run and as you have 10.5:1 that is very high to still run any boost 8:1 is what is normaly recomended for those chargers with 9 or 9.5 being the higher end before i rebuilt mine this last time i was running 13:1 but it was not good for driving around town so i shaved the tops of the pistons down and brought it back to 9:1 and plan on supercharging it but have not done so yet
hope this helps
hope this helps
Racer
Joined: Jul 2003
Posts: 304
Likes: 0
From: Corinth Tx
Re: Vortech supercharger (norvalwilhelm)
that is what i am saying but i did not do it my self i had it done and then had the pistons rebalanced i dont know if this is somthing you may consider or what type of pistns you have but mine were very high dollor so i did not just want t replace them but if they had been cheaper i probably would have just put new ones in
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: Vortech supercharger (dewcustom)
Wish I had known I could just mill the top off my 11 1/4 big block pistons when I needed a little less compression. I looked at that option but decided that once the domes were cut I would not have any metal left. I did section a piston and found the raised domes were also raise on the underside so if I cut the humb off I would be right through the head and looking at the crank.
I spent the $900 and bought blower pistons to be on the safe side.
[Modified by norvalwilhelm, 2:54 PM 9/14/2003]
I spent the $900 and bought blower pistons to be on the safe side.
[Modified by norvalwilhelm, 2:54 PM 9/14/2003]
Safety Car
Joined: Oct 2000
Posts: 4,080
Likes: 565
From: Allen TX
Re: Vortech supercharger (dewcustom)
I agree with dewcustom. I can speak directly to the Vortech blowers, as I have run several on several different vehicles ('90 Mustang 5.0, Saleen S351, '94 Lightning truck). They are very efficient, and will give you very good service life.
I had a little S-trim unit on my 302 stroker (331") that put out over 600rwhp and I was only turning 6000-6200rpm. Obviously, it had a good set of heads, intake, cam, exhaust, but it was the 14psi from the blower that made it tick. CR was 8.8:1 and I ran 93 pump gas if I wanted to.
I seriously considered putting one on my BB Stingray, but the problem is packaging. I think it would honestly be as easy to fab up a turbo system under the hood of a C3 since the blower sits out in front of the intake like a typical accessory and not on top of the intake, like Norval's positive displacement beast of a blower. :)
I had a little S-trim unit on my 302 stroker (331") that put out over 600rwhp and I was only turning 6000-6200rpm. Obviously, it had a good set of heads, intake, cam, exhaust, but it was the 14psi from the blower that made it tick. CR was 8.8:1 and I ran 93 pump gas if I wanted to.
I seriously considered putting one on my BB Stingray, but the problem is packaging. I think it would honestly be as easy to fab up a turbo system under the hood of a C3 since the blower sits out in front of the intake like a typical accessory and not on top of the intake, like Norval's positive displacement beast of a blower. :)
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Racer
Joined: Mar 2001
Posts: 372
Likes: 1
From: Ellicott City MD
Re: Vortech supercharger (dewcustom)
...so i shaved the tops of the pistons down and brought it back to 9:1
Melting Slicks
Joined: Dec 2000
Posts: 2,635
Likes: 0
From: Union Ontario
Re: Vortech supercharger (norvalwilhelm)
dewcustom are you saying you had 13 to 1 compression then you shaved the piston domes down to 9 to 1 compression?
Racer
Joined: Jul 2003
Posts: 304
Likes: 0
From: Corinth Tx
Re: Vortech supercharger (MikeC)
the way that i found my comp is mathmatical and i am not sure if there is a way to do it with out takeing off a head
as for the integrity of the piston, this was a reputable engine builder that many difrent people from all over the area said was the best sbc guy around and i was not crazy about it when he suggested it but he said he did it all the time w/o problems and that was two rebuilds ago. saw nthing funny when it was apart and it run very smooth infact if you were to put in some realy good ear plugs and go look at it runing you would think it was shut of and that is with it at any rpm. he did a heak of a job balaceing everything
as for the integrity of the piston, this was a reputable engine builder that many difrent people from all over the area said was the best sbc guy around and i was not crazy about it when he suggested it but he said he did it all the time w/o problems and that was two rebuilds ago. saw nthing funny when it was apart and it run very smooth infact if you were to put in some realy good ear plugs and go look at it runing you would think it was shut of and that is with it at any rpm. he did a heak of a job balaceing everything
Pro
Joined: Dec 2001
Posts: 708
Likes: 0
From: Renton Wa
Re: Vortech supercharger (dewcustom)
Milling the face of a piston "can be a very very bad idea, Expecially if your thinking about going Forced Induction. now it can be just fine in mild performance use, or lower cylinder pressures.
You will want right around 1/4 inch of crown thickness, Any less and if you lean out at all, expect to find a hole in the pistons. I think for the 500 or so bucks it costs for a good set of dished forged pistons, it's worth the money over risking popping the engine apart.
You will want right around 1/4 inch of crown thickness, Any less and if you lean out at all, expect to find a hole in the pistons. I think for the 500 or so bucks it costs for a good set of dished forged pistons, it's worth the money over risking popping the engine apart.
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: Vortech supercharger (WashingtonRacer)
I agree, I would like to know what brand and type of pistons you are running that aloowed so much material to be shaved and still remain integrity especially in a forced application.
I have 22 cc dished JE's
[Modified by Twin_Turbo, 3:12 PM 9/15/2003]
I have 22 cc dished JE's
[Modified by Twin_Turbo, 3:12 PM 9/15/2003]
