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Author Topic:   Ideal Engine?
marty
Member
posted December 29, 2001 03:20 PM
I just wondered what peoples current thinking was as regards the best engine for a 3000lb car racing on 1/4 to 1/3 mile dirt ovals(some with tight turns & little banking).Our rules over here in England say that the engines can be "unlimited" but they must have a cast iron block & be normally aspirated(no nitrous) & they must run on no more than 100 octane ron pump gas.
Thanks,Marty.


sdhnc29
Member
posted December 29, 2001 05:05 PM
With no more than 100 octane fuel , you'll be limited on compression . So I would think a long stroke engine would be your best bet . Perhaps a 406ci to a 430ci . You'll need the long stroke for torque , and with a limited compression ratio , a short stroke engine would be lacking in that department . Do they actually check your octane in your fuel ??? What do they have to enforce this rule with ???

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


marty
Member
posted December 30, 2001 05:45 AM
Thanks sdhnc29.Yes,they do test the fuel!Usually just at our European & World championships though but other drivers can pay $150 to have another drivers fuel sent away to a lab for testing(if the other driver is guilty they get banned for 2 years & the fine is that they must repay the driver who had the test done).There is also talk of introducing a piece of portable test equipment marketed by mastrad(look under petroleum at www.mastrad.com or e-mail them)but this could prove too expensive.
Currently most of the drivers over here run BB Chevy 454-560cu inch but quite a few are now running Chevy SB 420-460cu inch although one guy is going to try a Chevy BB with a overhead cam conversion next season with 800+bhp predicted!although i think they would struggle to put all that power to the ground.So i'm also looking for an engine that would keep the centre of gravity as low as possible(but we do have minimum centre of driveline rule of 10 inches).
Thanks,Marty.
quote:
Originally posted by sdhnc29:
With no more than 100 octane fuel , you'll be limited on compression . So I would think a long stroke engine would be your best bet . Perhaps a 406ci to a 430ci . You'll need the long stroke for torque , and with a limited compression ratio , a short stroke engine would be lacking in that department . Do they actually check your octane in your fuel ??? What do they have to enforce this rule with ???




sdhnc29
Member
posted December 30, 2001 12:17 PM
Sounds like some pretty funky rules !! Why are you looking to lower the center of gravity in a dirt car ?? What type of car's are you guy's running ? Chassis , rear suspension , tire size , Left hand drive , right hand drive , etc.? I'd love to have some English dirt in North Carolina , if you guy's are hooking up B/B engines on 1/4 mile tracks !!!!!! If you get time , let me know what your running , I'm always interested to hear what's going on in other parts of the world ! I raced in Australia for several seasons (our off seasons, winter for us) back in the early to mid 90's . They were right hand drive cars , yet we still turned left ! Had a great time , and was amazed at some of the tracks we went to ! Anyway , if you get time , it would be cool to find out more about your racing in England !

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


marty
Member
posted December 31, 2001 01:06 PM
Thanks sdhnc29.Further to the e-mail i sent you a ball-park figure for the gearing we use is:- 1:1 drive in the box with a 5.7:1 diff' & 15inch rims,rr tyre is usually 86 inch circ' & lr is 80 inch circ'.
If anyone else has any thoughts on what other engines are worth consdering & why please let me know as we are still chevy lovers over here unless someone can convince us otherwise!
Thanks.
Marty.


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