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John B

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About John B

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    Senior Member

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    '03 Caterham SV
    2.5L Cosworth MZR
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  1. Simon, that looks great and should be a blast! I think you'll need a Cowboy makeover to pull off that Montana plate though
  2. Thanks Croc. it held up with the 2272 hp MZR. i’ll be careful with it. but... Just in case, what’s a good Plan B?
  3. I think the C.R. is 12:1 but am re-checking with Hasselgren. The 2.3 Cosworth Duratecs used in the Swift 016 Formula Atlantic racecars spend most of their life at 8,900 rpm and get get rebuilt at 15 hours (1,500 miles). This engine will probably have an average rpm of 3,500 throughout it's life with brief spurts up to 8,000 on the street. But it will get a few hours of 7,000-8,000 at track days. I'll log track time and shoot for a rebuild after 20 track hours (about 10 track days). I'm not sure what the trans is, but I know it's not a Sadev. It's a 5-speed of some type. The car is
  4. It was dyno’ed on 93 octane pump gas
  5. It looks to me like it "wants" to live between 7,500 and 8,500, where the power stays about flat at max. But... given that I'd rather not turn this one into a coffee table, I'll keep it below 8,000.
  6. Final pull: 325 hp @ 8.100 244 tq @ 5,700
  7. Correct Croc, it was actually my son that made it go boom. Both times actually... This one will rev to 8,500, but I’ll mostly keep it below 8.
  8. Well it’s been about a year and a half since I blew a hole in the block of the 2.5L MZR engine in my SV at a NJMP track day late in the summer of 2019. Covid induced delays at my engine builder Hasselgren Engineering slowed things down quite a bit. I’ve suffered a fairly severe case of Caterham withdrawal as a result. My wife and I are on a trip out to Santa Clara, CA to visit our son and we drove around the Bay area doing some hikes and stopped for lunch in Berkeley, where Hasselgren’s shop happens to be. Paul Hasselgren has been building the race engines in the Formula Atlantics my son an
  9. For me personally a lot depends on the intended use. Generally, these are my criteria for cycling tires. Daily Driver used for routine local errands: Black Round Tread remains Hold air High performance street car: four above plus the 6-year life. Race car: 6 heat cycles.
  10. Congratulations Craig! Well deserved
  11. Croc - Make sure you use a billet or forged crank in the 2.5L Duratec
  12. I just got up to speed. Your new car sounds awesome Croc! One thing, and I'm speaking from experience here, make sure you use a forged or billet crank! You'll have to have it custom made. That's basically the same engine I had in my Cat when we blew it up last year but engine builder figured a cast 2.5L crank from a Ford Ranger pickup would be ok because it's a street car. - NOT! How was the event? I need posts and pics
  13. Oh Ohh! What did Croc get? I think we're squeezing all we can out of this NA Cosworth Duratec
  14. I still don't have my engine back from my builder in CA :toetap05: So I'm not going to make this one. Have fun and stay safe! Best to all, John
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