Originally Posted by wyvern
Carby, prolly a Holley 750 (347x7200-odd/3456 =722, I'm assuming blower increases volumetric efficiency). I don't want any engine management or fuel injection stuff: if it fails near some country town it's likely the locals won't have the first idea of what's wrong, let alone fix it. I have a set of Keith Black hypereutectics pistons from the first engine builder, but the current engineer is getter better forged ones.
I was hoping BlownV8 would reply, I noticed he has a Autorotor blower (which from their website CAPA don't appear to supply), I was wondering if there was some particular reason for that choice. Perhaps it fell off the back of a truck.
Is it possible to get a clutch or something for a supercharger, so it can be engaged/disengaged by the driver? (I keep remembering Mad Max flipping a switch in the Intercepter and the blower suddenly come to life).
And I'd still like to know if 351 timing is worthwhile. I might ask in the Windsor section.
Its been a while since i've been on. Hope the following info will give you some ideas.
In my project i was using a newer 5.0L block, with the injection system. These newer motors actually use 351 windsor timing. Thats probably where the confussion has come in. Old carbie, and new injected 302's do have different timing. I persopnally can see no advantage to one or the other, thats just what came from the factory.
As for the blower, the reason i chose autorotor, is that is is a twin screw possitive diplacement unit. And only needing a maximum of 13,000 rpm to achive maximum power. Vortech's and other centrifugal blowers are like turbos and need 80 - 90,000 rpm to achieve peak boost levels. This equals heat, an engines worst enemy. With the autorotor, these is less need for intercooling, aftercooling or methanol injection to reduce intake temps, as they are quite o.k. already. The reason i was running NOS on it as well was for drag racing only, and i was mainly using it to cool the intake just a little bit more, for a bit more squirt on the track. I was only looking at about 50 - 75 shot at best.
One thing to keep in mind when selecting blowers too is that the MK1 capri does not have a bog engine bay, you would not fit a vortech on the side of a windsor without seriously cutting out the inner guard of your car. A roots blower, with carbs on top, will hang out the bonnet, and draw unwanted atention. The twin screw blowers like autorotor, sprintex, PSI and whipple are a very compact unit, and draw air from the end of the unit, not top, so are easier to fit under bonnet, giving that street sleeper appeal.
Hope this info helps you make some descissions.
I actually have to change my signature, as i am no longer slotting a 302 between the struts of my capri, i have chosen to put something very different in. But the above was my plans. If you choose to use a top mount roots or twin screm blower, let me know, i can email you the drawings of my custom intake manifold to sit on a windsor engine. The same manifold will get one of these blowers under bonnet in an EB - AU engine bay also.