[DeTomaso] DeTomaso Digest, Vol 38, Issue 22- COMPRESSION RATIO

[Art Stephens]

Big Bob,
     You are coming in loud and clear on the compression ratio. :-))   I'm 
now looking at 10:1.  By the way,  what heads do you have on your car?

Thanks,
Art



----- Original Message ----- 
Sent: Saturday, September 22, 2007 5:00 PM
Subject: Re: [DeTomaso] DeTomaso Digest, Vol 38, Issue 22- COMPRESSION RATIO


> First I did break my motor but it was only the water pump
> impellor that fell apart causing what I thought was also a
> blown head gasket.... no bad gasket... checked everything
> else and put a new set of springs and seals back and it is
> running again.
>
> My compression is 9.6 to 9.8 to 1
> My builder stated we could go up but (Art are you
> reading this) then the life of the engine goes down
> We are talking a 20 hr track time motor vs 40 to 60
> hours of what I wish to clarify (hard running time...
> like you drive on the street Art)  I have one Shelby buddy
> with a 331 at 500 hp same compression as mine and he
> has 80 plus track hours on his motor (uses and hour meter)
> he runs only pump gas 91.... he will be rebuilding this
> winter as he is on borrowed time.
>
> Yes Hp goes up with compression but as Garth stated
> you can build 550 to 600 hp motors without going way
> up in compression unless it is injected which will let you
> go a little higher.
>
> I do use race gas when I track the car but only 40 to 50% just
> to lube the valves and keep them from rattling... my motor is a 7500  rpm
> motor but I run the rev limiter (which I bounce off a lot) at 6800
> this also lets the motor live a little longer. I also learned that
> the rev limiter does not work in a downshift so use the damn brakes
>
> My car is not a full race car like the Escahoff 13 1/2 to 1 car
> It is nice to drive on the street and pull up to the pump and
> filler up... You can also do short blasts here and there but
> I can tell you with close to 600 ponies 140 plus comes up
> real quick.... Save your real hard driving for ORR or the track
> sweeten the gas and detonation will not be a problem... plus
> it is a lot safer with helmets (flame suit) and people to help
> standing by if a problem does come up.   Most of my Shelby
> buddies do not use any other gas other than 91 pump gas
> I just do it because it is like an insurance policy for my motor
>
> My 4 cents
>
> Bob Benson
>
>
>
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