IS there Any chance to Make this work with euro 98e 5% ethanol Fuel. Lysholm 3300ax should Be close to whipple 200ax. Was thiking around 5psi Max boost.

-10 to 1 comp
- 240/245 @050, 114lsa, hyd roller
- flotek 290cc aluminum heads
- Port injected weiand 1985 tunnel ram

why not build a na engine its simple reliable we turn our 540 to 7000 so its easier on the drive its loud and fun keep it simple!

This IS fresh build, 670hp N/A power at 6000rpm. All The clearances Are For boost and cometic mls head gaskets. I know nothing about blowers. Here IS new unused 3300ax For Sale, 1200$

E85

Not in marina

if I am reading the comparison chart right then 98e would be roughly our 93 so I would say that you are about at the limit for a N/A motor at that compression for safety reasons. I would think adding boost would be a bad idea without lowering the compression but that is just my opinion.

I'm at 10.25:1 on my N/A BBCs and I have to use 93 oct exclusively. I suspect running 10:1 static compression with forced induction will likely cause detonation.

Yup, way too much compression.
You want to be closer to 8.5:1
Mercury 1075sci for example is 7.9:1

Jani, there's a few issues with using a blower on your combo. Yout cam likely had too much duration...adding a blower will push the HP/TQ peaks up by about 500 rpm, making the cam even worse for your required rpm band.

Your intake manifold injector locations may not be optimally placed...if I remember correctly? Port injected blower doesn't have the latent heat removal from an above rotor injected system.

Your 10:1 CR is a big issue with marine sourced fuel.


10:1 with 5 psi boost would give you an effective CR of 13.4:1. It would be nothing but trouble for you. The chart suggests not exceeding 12:1 effective with street 92 Oct (RON+MON/2). Trying to retard the timing would be hard on the exhaust valve...and likely heat it up to the point of being the cause of detonation or pre-ignition.

Not to mention, your BSFCs would climb up, making you less efficient overall.