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Thread: Interesting Engines in a Sportster

  1. #21 Re: Interesting Engines in a Sportster 
    club member Club Member Mike's Avatar
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    Quote Originally Posted by phil.coyle View Post
    I have had my air intake ducted from the side louvres for at least 12 years with out any problems...........
    There is no loss of power, and air being air is always there, otherwise when travelling forward and you stick your head out of the car your lungs would be emptied...............
    Phil

    I'm not sure I agree with this ...... stick your head out of a car travelling at high speed, face backwards, and you will not be able to suck the same volume of air in as quickly as compared to at rest. The air rushing past your open mouth tries to create a vacuum, and you find yourself gulping air in, not just breathing normally.... try it!

    Have a look at Bernoulli's principle:
    Blowing air across the face of an open tube will reduce the air pressure at that end, causing air to flow out of the tube as the pressure tries to equalise at the two ends of the tube.


    Applying this to our cars, normally aspirated internal combustion engines operate by creating a vacuum to suck air in: having to compete with the vacuum created by air passing over the side air inlet will have a detrimental effect on its maximum in flow rate, which ultimately will translate to less power output.

    An interesting exercise would be to try your car's maximum speed in a straight line with your current air intake, and comparing it to taking the inlet up to the nose cone where it can get ram air.... my guess is you will be able to record a small difference?

    Translating that to Peter's thumping great 3.9 litre V8 it is very likely to cause some loss of power at maximum rpm.

    Mike
    Last edited by Mike; 26-05-2016 at 10:14 AM.
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  2. #22 Re: Interesting Engines in a Sportster 
    frequent forum contributor Club Member greyV8pete's Avatar
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    Mmm. That's kind of what I had thought Mike. I will stick to improving the air feed from the front . BTW Mr Bernoulli also makes carburettors work well . Peter.
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  3. #23 Re: Interesting Engines in a Sportster 
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    My air filter just pokes straight out the top lol.
    I wonder if the ram air on the front face cancels out the suction on the rear face?
    I don,t actually care much, the air slurping sound is AWEsome.
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  4. #24 Re: Interesting Engines in a Sportster 
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    Old thread but maybe someone is watching...

    I've heard it's a heck of a job modifying the Mazda mx5 2L mk 3/3.5 2009 engine to work in a kit car/sportster is this correct? I don't mind some playing about with components but budget is tight.

    I believe the 1.8vvt engine is practically drag and drop.

    Both to go on a 6-speed mx5 mk3.5 sport gearbox, assuming the gear stick isn't too far back in the tunnel...failing that mt75.

    Any experience or knowledge to help a newbie out?

    Kieran
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  5. #25 Re: Interesting Engines in a Sportster 
    club member Club Member stevejgreen's Avatar
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    Quote Originally Posted by kieran78 View Post
    Old thread but maybe someone is watching...

    I've heard it's a heck of a job modifying the Mazda mx5 2L mk 3/3.5 2009 engine to work in a kit car/sportster is this correct? I don't mind some playing about with components but budget is tight.

    I believe the 1.8vvt engine is practically drag and drop.

    Both to go on a 6-speed mx5 mk3.5 sport gearbox, assuming the gear stick isn't too far back in the tunnel...failing that mt75.

    Any experience or knowledge to help a newbie out?

    Kieran
    I always wanted to build a Toyota, preferably 3.0 straight six 2JZ powered kit, either with a 6 speed manual or a 4 speed auto. That could have been fun!
    MOC member since 05/97
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    The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

    Loads of Marlin Reference can be found documents here or there.
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  6. #26 Re: Interesting Engines in a Sportster 
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    Change of plan...
    Jaguar AJ30 3.0L V6 to either the Jag Getrag 221 manual box or a Mazda RX8 box.
    If I'm going to have to IVA/SVA the engine swap, I may as well make it worthwhile!
    I've found loads of links but has anyone done this/advice and most importantly, COST?
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  7. #27 Re: Interesting Engines in a Sportster 
    club member Club Member jon_wilkinson's Avatar
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    Have you seen the Rocketeer conversion for the MX5? Might be some parts that could be useful?
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  8. #28 Re: Interesting Engines in a Sportster 
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    Hi Kie Zetecran, welcome! My car runs the old i4 8 valve twin cam that Ford fitted to fuel injected Sierras post Pinto, pre Zetec so you'll probably find it a bit pedestrian for your taste...after some trouble getting it to run properly which a re-con cylinder head sorted out, it's OK for now. I had considered tne Jag V6 conversion with an auto box: this would enable more left foot room in the footwell as well as providing more than adequate power, with twin custom exhausts under each running board (assuming you have them). I believe the Jag motor is a Ford design anyway, but taken from a suitable S-Type, would at least have all the necessary for Rear Wheel drive? When I looked into this eBay was selling suitable engines for low hundreds....and donor-suitable complete S-type running cars were not much more, with all the extra bits one might need?
    Good luck ...sounds interesting!
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  9. #29 Re: Interesting Engines in a Sportster 
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    Hello and thanks!
    Bought a 63k mileage v6 3.0 manual s-type for pennies (with mot) so no going back now! DAUNTING is word underused these days but adequately applies now!
    I'm still working on the parts list to adapt it, with an aim to reuse as much as possible. I know the ECU will need to be replaced with an Emerald K6, undoubtedly a new loom, st220 inlet manifold thing on top of t engine (height reduction) and st220 sump to clear front anti roll bar. I believe I'll need to relocate the alternator, redo the fuel lines and a bunch of other stuff......

    It's all just nuts and bolts at the end of the day, right?
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  10. #30 Re: Interesting Engines in a Sportster 
    club member Club Member dcunn's Avatar
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    Good luck - and enjoy the spannering !

    Looking forward to your build diary on here

    DC
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