[F500] Rotax conversion

[Jeff Blumenthal]

Sheldon,
  I'll take the first stab at these questions: Others can add to, or 
correct...


Sheldon Lemoine wrote:

>Well, now that we have a Rotax I need some help figuring out what else is needed to make convert our '90 KBS Mk V.  The car is only being used for autocross and already has the 4-link suspension upgrade.
>
>1. Does the frame need to be modified for the Rotax to fit?
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>
You'll need to set the motor in place and find out. Remember to attach 
the carbs when you do this. Fitting the Rotax into a KBS Mk7 (with 
4-link conversion) would not require frame mods.

>2. What's the best exhaust pipe for solo?
>  
>
There are several vendors on this list that provide pipes/manifolds. 
Sidewinder has them on their website. I think Kenny Price makes a pipe.  
Most competitors that I know use the manifold and pipe from Aaen 
Performance.

>3. What's the best y-pipe manifold?  Is this dictated by the pipe?
>
>4. Can a Comet 4-Pro from an AMW be used on a 494?  Does it need to be modified to fit?
>  
>
If you're changing from an AMW motor, you'll have to get the Clutch 
taper machined. Gary at Micro-Belmont can help.

>5. Do I need to make my own engine mounts or does someone already produce a kit for this conversion?
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>
I think Mike Quadrini at QRE can supply.

>6. Anything else I should know?
>  
>
If you're converting from AMW, you'll need to get a new throttle cable 
assmbly.  The Rotax requires a junction box with 3 cables (2 carbs + 1 
oil injection).  Tony Murphy offers a real nice unit.

I'll open a can of worms with this one....and it applies if your doing 
the AMW switch to Rotax...most people I knew with AMW used an electronic 
fuel pump.  The same can't be said for the Rotax.  There are some with 
electonic fuel pumps, regulators, etc.  There are some with the Mikuni 
diaphram pump (I'm one of those). Fuel delivery has been an issue for 
many of us in Solo.  Most of us have experienced the dreaded bog after 
Rotax conversion. And most of us have solved it in different ways.  I'm 
sure you'll get a variety of input regarding fuel delivery and the 
"dreaded bog".

>
>I can hardly wait to get a nice reliable engine in our car so that we can focus on driving rather than rebuilding engines!
>
>Thanks,
>
>Sheldon
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