Wally, how bad was the plenum blown up?

D, it should work fine with either type since, technically, a turbocharger IS a supercharger. It just gets its drive from the exhaust rather than the crank.

What he means by blow off valve, is a purge (or overboost) valve. This is used in the event of a carby backfire or sudden increase of excessive boost(like a disconnected actuator hose). Similar to a blow off valve in design, usually vents externally. Is anyone familar with Jake Edwards' big single turbo yellow LH torana? As this features one directly on top of the plenum and is clearly visible. Backfires whether caused by leaning out or nitrous use have been know to split plenums like wallys, intercooler tanks and piping.

We are in the process of setting up a turbo EFI on a race 1200 coupe
The S/S plenum split around front end weld I cut it up to use the flange plate on my current set up

Even the V8 671 style blowers have an over boost valve it is usually a spring loaded cap/s in the blower manifold. While in a friends supercharged Torana a couple of weeks back he had a carb backfire and the blower stopped spinning so quick it snapped the end of the forged steel crank !! Pro Stock and Funny Car drag cars have sheet metal blow off plates in their manifolds to stop blowers flying off in backfire situations.

yes,that's what i meant,an overboost blow off.all the supercharged open wheelers running the nsw hillclimb championships have them fitted,due to the needed to back off for corners.i know they aren't 'look at me,i've got a turbo' valves,but just a pressure relief valve to prevent damage to blowers & mainfolds.

sorry,i used the wrong term to describe it,a valve or a burst panel was what i meant.all the supercharged hillclimb cars in the nsw hillclimb championship have these,as they all run billet superchargers,& manifolds.they don't want to break one of these,so they have valves to dump pressure.not one wants to be like john force.

I sit corrected. I had forgotten about the safety valves. They do however blow an air/fuel mixture out when the go off. I guess a small quickly extinguished engine bay fire is still cheaper than sending a Rootes type blower several hundred feet into the air!

Tim It takes a man or a real 1200 nutter to admit to being stood corrected I like that

Hey Dimlight,

I got the adaptor plate a few days ago, thanks for that man :) it looks good

Peace

SLAM1024

ive got an L20 with twin 40 mm webbers aet up as blow through. on deaccaleration it used to hit 30 psi so i put a blow off valve on. it then blew off the blow off valve. i had to fit a switch on the accelerator peddle thas turned off the supercharger on deacceleration.

Yikes! You would NOT want a blowoff valve on a draw through system like this! That would vent air/fuel mixture into the engine bay!

As an aside, too bad about blowing that up, it is farking gorgeous!

Tim don't fret I only blew the plenium up the rest is fine

Paul DO NOT EVER fit a blow off valve or a turbo whooshie thing on a flow though set up or you will get more bang than you ever wanted.You wil be smokin at the wrong end