Four vs Six, comparison questions |
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Four vs Six, comparison questions |
johnmhudson111 |
Aug 16 2005, 09:02 AM
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#161
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Member Group: Members Posts: 491 Joined: 29-November 04 From: Nesbit, MS Member No.: 3,191 |
I am sure ths has been discussed before but I couldn't find anything using the search. So, has there been a comparison done between a 911 six and big four, like Jake Raby's engines? Looking at:
1. Overall cost of engine (plus consideration of the cost of the conversion to a six from a four) 2. power hp/tq 3. engine life 4. other issues? |
john rogers |
Aug 16 2005, 09:16 AM
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#162
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
I went through this a while back and here is what I found. Both the 2.7L four I had and my 2L six have 185 HP at the rear wheels on the dyno. The four would last about two race weekends and need work. The six has been in 1 1/2 years and runs right along as it was made to rev to 9000 RPM and I rarely go over 8K. The four was easier to drive, only had to shift into fourth once at Willow Springs to go over the hill as the four had much lower and flatter torque curve. With the six I shift all the time, even into 4th at turn nine. The cost of five years of engine work on the four was probably much higher than the cost of the six conversion, but I have never added it up. Both engines were dry sumped with front oil coolers so no difference there. Many will say a big four can be made to last but with road racing the high horse power fours will not last as long as a comparible six. If you cut the power back to say 130 at the rear wheels they would last longer and to be competitive really cut weight of the car down to 1800 pounds, you can win against the six's easily.
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