Thread: Supercharging a 3.5

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  1. #1 Supercharging a 3.5 
    Little Brit
    Join Date
    Feb 2012
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    26
    Hi Guys

    I may be able to get an Eaton M62 supercharger for my RV8.

    Using the standard inlet mani (opened up to fit 2" SU's), decent extractors and a front mount intercooler. What kind of power do you think I could get/how much boost it would be safe to run (ball park figures).

    Would be using 98 octane fuel and SD1 heads.

    Has anyone had experience with this?
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  2. #2  
    Cammy,

    I am building a similar setup minus the SU's. I am going to be running stock compression 8:1. I plan on running between 10-15lbs of boost.

    I also running a cometic headgasket and ARP head studs.

    With 98 octane you have a real advantage. I would think you will probably be able to run 10psi, but not sure how much of advantage it will be as I think the SU's will be holding you back.

    If you could get 220whp I would be happy with that.

    Here is my build up.
    http://www.thewedgeshopforum.com/viewtopic.php?t=620

    Thanks
    Clint
    The Wedge Shop
    The Wedge Shop
    Fast.British.Reliable.
    www.thewedgeshop.com
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  3. #3  
    Little Brit
    Join Date
    Feb 2012
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    I was thinking about uprated headgaskets, and ARP head and main studs at least.

    The SU's are from a 4.2L Jag and are quite sizable. May not be as good as some of the other options but they were free, fit the standard mani and I am on a bit of a budget with this one :lol:

    Standard compression on my P6B motor appears to be 10.5:1 but the SD1 standard comp is 9.35:1.

    Do you know if the pistons etc were the same and the comp change was due to gasket thickness/chamber volume? Or were there other differences?

    9.35:1 would be more suitable than 10.5:1 but not sure if just putting my SD1 heads on will do that (probably not)?

    I'll have a read of your project.

    Cheers
    Cam
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  4. #4  
    Ole Boy
    Join Date
    Feb 2012
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    Mt Pleasant SC
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    795
    Will they fit under the bonnet. That's the real question
    Don

    "Stick a Wedge In It"
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  5. #5  
    If you look deep enough in cyberspace Im sure something may come up about the Janspeed turbo kit that was once offered for sale.
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  6. #6  
    If you want it to fit, it will fit. I will be making a custom carb hat for my setup.

    Thanks
    Clint
    The Wedge Shop
    Fast.British.Reliable.
    www.thewedgeshop.com
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  7. #7  
    Young Brit
    Join Date
    Feb 2012
    Posts
    90
    > With 98 octane you have a real advantage.

    Clint, the octane rating system used in New Zealand is not the same
    as the average of Reasearch and Motor octane we use here in the
    States. It 98 RON is roughly equivalent to 94 AKI octane here.

    > May not be as good as some of the other options but they were free,

    In the United States, Offenhauser 360 (the split plenum single plane)
    intakes are often used to mount Roots style superchargers. They are
    low profile and essentially a box plenum with a center divider.

    > Do you know if the pistons etc were the same and the comp change

    The compression difference was due to the pistons. One option would
    be to use the later thicker composite headgaskets.

    > but not sure if just putting my SD1 heads on will do that (probably not)?

    No.

    For reliability, Magnusson/Eaton recommend an M62 blower speed of no more
    than 14000 RPM. Assuming you want a maximum engine speed of 6000 RPM, that
    implies a belt ratio of 2.33. I ran that through Dynomation on a TR8 Rover
    3.5L with Woody's small street Erson cam and an M-62 blower. The blower
    appears to be undersized and not well-suited to the Rover 3.5L V8, providing
    only 5 PSI at 6000 RPM engine speed and 14000 RPM blower speed. They use
    those blowers on Cobalt 4 cylinder engines. Ford used the larger M-90 on
    3.8L V6's. That seems to work better in the simulation, producing 9.5 PSI
    @ 6000 engine RPM under the same step up ratio.

    > If you look deep enough in cyberspace Im sure something may come up about
    > the Janspeed turbo kit that was once offered for sale.

    This is the one I have:

    http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars/album10/Janspeed+Rover+V8+Twin+Turbo/

    Dan Jones
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  8. #8  
    Little Brit
    Join Date
    Feb 2012
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    Quote Originally Posted by Don Kelly
    Will they fit under the bonnet. That's the real question
    Unlikely, but I'm not opposed to modifying the bonnet.

    Thanks for all the info Dan. The people with the Eaton wanted more than I could give them. Currently working on getting an SC14 Toyota charger.

    If I can get 5-7psi out of one of those that might work well with a lower comp (using a thicker gasket) of say 9.5:1 which is still higher than the 8 or 8.5:1 you might normally see when running more than that?

    At the end of the day I'll take what I can get. If I can't get 10psi I can't get 10psi

    By the way, this is the motor (it needs freshening up):



    I've now sorted the 2x RV8 5spd boxes, duplex timing chain kit (adjustable) and electronic ignition module with dizzy.
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  9. #9  
    Dan,

    Good work as always. I thought having 98 octane seemed a bit high, makes sense now. 94 is still pretty good. They stopped selling that stuff around here a few years ago.

    From what Dan said, I am not sure being only able to get 5-7 psi reliable psi would be worth all the work. You could build a 10.5 compression NA 3.5 that would be very peppy and put down some good numbers.

    Dan, what were the HP numbers on those simulations?

    Thanks
    Clint
    The Wedge Shop
    Fast.British.Reliable.
    www.thewedgeshop.com
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  10. #10  
    Little Brit
    Join Date
    Feb 2012
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    26
    I have got the SC14. Does anyone have experience setting up SU carb's to run blow through forced induction?

    Clint

    I know what you mean and in most circumstances would agree. In this case though, I have read through Des Hammill's book on tuning the RV8 and came to the conclusion that getting the my motor to rev higher and put down 200hp or more (reliably) would cost a fair bit more than a charger setup (the SC14 has cost me (350NZD). This build is limited in funds due to purchasing a house and my primary project being the 405 race car.

    It's also just about being different I guess. I've seen Rover V8 powered Triumph saloons before but never a supercharged one.

    The SC14 also has the advantage of an electric clutch and by-pass so that I can flick back to N/A at the press of a button. If I'm still running 9.5:1 or above comp then it should still go just as well as a factory motor.

    Combining an intercooler with the water injection system outlined at the bottom af the page below. I think it would be possible to get some pretty good results on a tighter budget than going for the same output N/A.

    http://www.fefcholden.org.au/techinfo/supercharge/norman6.html

    The system involves no motors or electrics and should not be too expensive to implement. Also, it only runs under boost.

    Also I think the WOW factor of a supercharged, intercooled, water injected V8 trump saloon would be worth the extra effort (the naivity of youth no-doubt :lol: )

    Edit - SC14 max RPM = 10,000 @ 1420cc per rotation. Would you be able to re-run your simulation using those figures Dan?

    Just thought I would clarify too. Another reason I think it may be cheaper to go down this route. I am reasonably skilled with mechanics and my brother is an engineer who can fab things. Neither of us have the facility or skills to do proper head work etc, which would mean going to a specialist for ~100NZD per hour plus to properly work a head, where-as we can mount the charger ourselves for just the cost of parts.
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