BC 280 cam degreing

[dnhieu]

if you guys cant tell from the pics my whole car has been in a front end collision and the motor doesnt sit perfect in their

thus the need for the hammer!

[sbengineering]

FYI, If anyone is having trouble degree ing the cams due to lifter bleed down, try using the centerline method!

[90laserRSfwd]

Originally Posted by sbengineering

FYI, If anyone is having trouble degree ing the cams due to lifter bleed down, try using the centerline method!

elaborate on this...

[Black95TSIawd]

You guys really need to take the AMS test with a grain of salt. The evo motor is a completely different monster than our motors. Someone on the dsmlink boards did a private cam shootout and with this 2.4L/T67 and BC280's made a tremendous amount of power compared to the HKS 272 setup. The GSC s2's made the most power meanwhile the bc280's came in a close 2nd.

[Turbo Monk3y]

Originally Posted by Black95TSIawd

You guys really need to take the AMS test with a grain of salt. The evo motor is a completely different monster than our motors. Someone on the dsmlink boards did a private cam shootout and with this 2.4L/T67 and BC280's made a tremendous amount of power compared to the HKS 272 setup. The GSC s2's made the most power meanwhile the bc280's came in a close 2nd.

Amen, I'm glad you mentioned this, because I was about to explode if one more person referenced the AMS EVO test... But I did follow this said test on the dsmlink forums and it is true.. the GSC S2's made the most hp and the BC 280's came in 2nd place about 10-15 hp behind the s2's.. and the BC's made the hks 272s look like stock cams... and he installed all of these cams straight up....

[90laserRSfwd]

what about this centerline method?

[sbengineering]

Ok, because I usually don't use a solid lifter to degree in DSM cams. I use the centerline method. Although it's not as in depth as checking 0.050 timing evens, it will tell you really quickly if your cam is where you want it at.

Example, for intake. I'll place my dial indicator on the spring retainer and zero out at TDC. I then rotate once around watching the dial and seeing what the max lift is. I noticed it was around .300. I will call this max lift (ML). I spin back to zero degrees and set everything to zero. I spin the wheel until I come to .280 before ML and I record the degrees (90). I then spin past the TL and stop at .280 and mark the degrees (110). I add the 2 numbers and divide by 2 to calculate the middle number ( 90+110=200/2=100). If i go to this degree location I will be at max intake lift and the intake centerline. I run the procedure 1 or 2 more times to make sure it is correct. I then check my my value (100) to the actual intake centerline (100). That shows i am straight up. If I got a value of 102 I would have been 2 degrees retard.

This method allows me to find out my timing without any relation to actual lift.

[Freerevving]

for anyone wondering what a sloid lifter is (never saw the question answered), it's a lifter that doesn't use hydraulics.

Usually used on race-ready engines, that have the lifters over the valve stems... with large cams, the hydraulic lifter becomes unresponsive and you get valve float... many people convert them to solid lifters to help eliminate this... they're also stock in older OHC engines....

The bad part, with solid lifters, is they need to be shimmed every so often.

The good part, is our engines are not designed that way and have practically no use for them (besides degreeing).

[dnhieu]

i swear its hard to find time to work on my car but you guys know what this means right? after i fix my clogged radiator and get an alignment its off to the dyno!

[Black_Bullet]

Any updates?

[dnhieu]

the only update i really how now is that im only pulling -5 vaccume since i decreed the cams to +3 and -1. i gained a little bit of spool up from my butt dyno and they sound alot meaner now.

[blcknspo0ln]

Cam degree-in degreeing-in degreeing