BC 280 cam degreing

[delta448]

YOU HAVE TO USE SOLID LIFTERS TO DEGREE THE CAMS, THIS IS NOT OPTIONAL

Yes. If you're measuring valve movement directly while degreeing.

There are other methods, I however, am not very familiar with them. They require more math, but measure directly from the camshaft lobes.

 

[droppinbottom]

I will be spending several hours on the dyno on July 26th and we will be playing with the cams to see what works best on my motor. I will be more than willing to post my results when it is all said and done.

 

[Black_Bullet]

Guys, I think he might have been talking about where 2gAWDTalon said "YOU HAVE TO USE SOLID LIFTERS TO DEGREE THE CAMS, THIS IS NOT OPTIONAL."

Thanks for catching that. Thats exactly what I was asking as I didnt understand the part about the solid lifters, and then I just rambled on about me not knowing how to deg cam gears... ^^

 

[90laserRSfwd]

Progress reports?

 

[i1nk83]

Well the progress is: David(dnheiu) is lazy and it hot outside so he hasnt installed the cam gears yet, I might have to drive down there and drag his lazy but out of bed so we can put em on..... right after i do mine

 

[gob4sho89]

I have bc 272's with stock cam gears. Idle is badass, and the car really comes alive at 3500rpm...

 

[twoTSis]

What cam gears and lifters would you guys suggests for the BC 280s?

 

[dnhieu]

sorry i have been lazy guys. i dragged my ass out of bed today to get this far before i had to go to work!

 

[JWoodley]

Gotta love the hammer on the fender well.

 

[Maglin]

Gotta love the hammer on the fender well.

Dude if it don't fit get a bigger HAMMER!!!

 

[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]

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]

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]

http://www.dsmtuners.com/forums/cylinder-head-short-block/314111-cam-degree-degreeing-degreeing.html