Supercharging a rover V8 engine

[Loverboymr]

Hi,

I really need help on how to supercharge a Rover V8 engine.
Spec is 3.5l with offenhauser inlet and holley 390cfm carb, hurricane camshaft fitted in an MG B convertible.

I have heard that the cheapest option and good one is to fit a eaton M90 or M112 supercharger. This part is easy to buy on ebay, but what else do I need? Are there any existing brackets to fit? Can I mount the supercharger on the side so I don't have the carb sticking out the bonnet like a foot! Also, can I keep my carb configuration?

Thanks in advance for your help,

Gerrit

[GreenV8S]

I don't think there are any good standard installations, if you're looking for cheap it will have to be DIY. I know somebody who has an M90 over the near side exhaust headers pulling through an HIF SU, that seems to work quite well. Mine is an M112 in the valley using fuel injection. If you can make up brackets and pipework etc you wouldn't have any trouble putting it together, if you were thinking of buying a bolt-on kit I think you would end up spending a lot of money for somebody to develop it first.

[Loverboymr]

Thanks a lot for your answer. So I guess the only way to keep the holley carb set up is to have the supercharger in the middle, which will make it stick out the bonnet?

[GreenV8S]

Perhaps you could blow through the holley (it would need some investigation to find out) but I don't think you will be able to pull through it if you're using an Eaton. Changing carbs is no big deal, surely. Are you absolutely set on keeping the holley?

[Loverboymr]

No no I could change the carbs. My other option would be to fit stage 2 head with hi rev valves.

I don't wanna make it unrealiable for only a few bhp more

[scooterscot]

You cant blow through the carb with a proper blower as it is a compressor and if you shut the throttle quickly from high revs it will blow the butterflies into the engine. We did a kit for the TVR wedge which had the blower ( a sprintex) mounted on the left of the engine to keep it below the standard bonnet. We also did a Range Rover kit for the 3.5 and the 3.9 the later kits used the opcon blower which was mounted in the v.

[Loverboymr]

The sprintex is probably the most logical one, but I enquired for the price in Australia where they are still making them and it was crazy.

I would be better off having the 5.2L RPI engine fitted.

I was just wondering if there was a cheap conversion like for the US V8 where you just put a S'charger in the V8.

Actually I don't care too much about having it go through the bonnet as long as I can still see where I'm going lol

[GreenV8S]

scooterscot said:

You cant blow through the carb with a proper blower as it is a compressor and if you shut the throttle quickly from high revs it will blow the butterflies into the engine.

It would be a naff design that did that, surely? Obviously you'd want to have a recirc valve in place and that would prevent boost spikes.

[Sonus]

Have a look at Bill Jacobsen's B here - http://www.britishv8.org/MG/BillJacobson.htm

It might give you a few ideas

[Loverboymr]

Thanks for the link, great car! I think I'd better start with fitting the RV8 manifold, as the standard one which doesn't go through the wings is restrictive as of 200 bhp

[V8LRO]

Will a M112 supercharger fit a Rover 4ltr V8 gems engine? If so how much work is involved or is there a kit?

[v8250]

V8LRO said:

Will a M112 supercharger fit a Rover 4ltr V8 gems engine? If so how much work is involved or is there a kit?

This a 13 year thread revival, impressive! Your best bet is to ask on www.v8forum.co.uk [not the FB page] - there are plenty of guys who have successfully supercharged an RV8.