Cams/Compression Quesion
Id rather do a rebuild for less than $10K easy, than go thru the hassle of selling or parting out/selling, and spending tons of money again on another platform Im going to end up blowing up anyways.
But yes simple, simple, simple and hope for the best.
I just have too much in it to walk away.
Id rather do a rebuild for less than $10K easy, than go thru the hassle of selling or parting out/selling, and spending tons of money again on another platform Im going to end up blowing up anyways.
But yes simple, simple, simple and hope for the best.
Id rather do a rebuild for less than $10K easy, than go thru the hassle of selling or parting out/selling, and spending tons of money again on another platform Im going to end up blowing up anyways.
But yes simple, simple, simple and hope for the best.
sorry for the thread jack.
FYI
BC Stage 2: 264 dur/222 dur. @ .050" lift/.10.82mm total lift
BC Stage 3: 272 dur/234 dur @ .050" lift/11.66mm total lift
JWT C2: 262 dur/225 dur @ .050" lift/11.58mm total lift
JWT C8: 272 dur/235 dr @ .050 lift/12.01mm total lift
For a given duration, the BC cams have less lift, meaning that they can rev higher before the buckets launch off of the cam lobes, which can be an issue, while the JWT cams provide more lift, meaning that there is less restriction of fluid flow into the cylinders. JWT generally recommends not to run their cams beyond 7200-7500 rpm. If you will be running beyond this rpm, the BCs would be a better joice between these two manufacturers for a given duration. You can compensate for the lower lift by applying more boost. If you do not intend to operate beyond 7500 rpm, the JWTs may be the better choice due to the greater lift. Of course, there are other factors that come into play, but these are the basics. One note, if you intend to operate at very high rpms, a billit girdle and billit main caps are upgrades worth considering. I won't be operating beyond 7500 rpm, but I still have them.
This is XKR's dyno with C8 cams on 4.0L stroked motor as measured on a Dynodymics dyno. According to that thread, it later accomplished over 1000 whp on a Dynojet dyno with the same setup:
I believe that both JWT C8 and BC Stage 3 cams have made over 1000 whp on DJ dynos on our platform. In the end, the decision should come down to your goals and how you will be using the motor. For operation <= 7500 rpm, I have slected JWT C8s on my new build. If I were operating >7500 rpm, I would consider BC, GTM and Kelford cams. The GTM and Kelford cams look to have very similar specifications, and I have heard that they also provide very good performance.
For additional referece, the dyno plot below was my 3.5L motor with C2 cams/Gretty TT kit on a Mustang dyno:
BC Stage 2: 264 dur/222 dur. @ .050" lift/.10.82mm total lift
BC Stage 3: 272 dur/234 dur @ .050" lift/11.66mm total lift
JWT C2: 262 dur/225 dur @ .050" lift/11.58mm total lift
JWT C8: 272 dur/235 dr @ .050 lift/12.01mm total lift
For a given duration, the BC cams have less lift, meaning that they can rev higher before the buckets launch off of the cam lobes, which can be an issue, while the JWT cams provide more lift, meaning that there is less restriction of fluid flow into the cylinders. JWT generally recommends not to run their cams beyond 7200-7500 rpm. If you will be running beyond this rpm, the BCs would be a better joice between these two manufacturers for a given duration. You can compensate for the lower lift by applying more boost. If you do not intend to operate beyond 7500 rpm, the JWTs may be the better choice due to the greater lift. Of course, there are other factors that come into play, but these are the basics. One note, if you intend to operate at very high rpms, a billit girdle and billit main caps are upgrades worth considering. I won't be operating beyond 7500 rpm, but I still have them.
This is XKR's dyno with C8 cams on 4.0L stroked motor as measured on a Dynodymics dyno. According to that thread, it later accomplished over 1000 whp on a Dynojet dyno with the same setup:
I believe that both JWT C8 and BC Stage 3 cams have made over 1000 whp on DJ dynos on our platform. In the end, the decision should come down to your goals and how you will be using the motor. For operation <= 7500 rpm, I have slected JWT C8s on my new build. If I were operating >7500 rpm, I would consider BC, GTM and Kelford cams. The GTM and Kelford cams look to have very similar specifications, and I have heard that they also provide very good performance.
For additional referece, the dyno plot below was my 3.5L motor with C2 cams/Gretty TT kit on a Mustang dyno:
Last edited by ttg35fort; Jan 9, 2011 at 11:22 AM.
thanks for all the good info TTg35fort
this is what scares me away from BC cams
junk bc said maybe they got dropped during manufacturing regardles they lasted ten min and ruined a 1200 dollar head.
this is what scares me away from BC cams
Originally Posted by Honda Forum
junk bc said maybe they got dropped during manufacturing regardles they lasted ten min and ruined a 1200 dollar head.
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