Really low vac with 274 cams

[dsmgsx98]

So I installed some Dsm graveyard 274 reground cams strait up and trying to figure out why the my vacuum is at -8 at 900rpm. I thought they would still have a vac of around -12 to -14 can someone that has these cams help me out

 

[JusMX141]

It is advanced three degrees. It took a while to study since on the pic of the purple gear in this thread the scale is on the opposite part than it is on the black cam gear in the link you provided....everything is reversed.

 

[dsmgsx98]

OK thanks justin that clears a lot up... so we should probably tell this Guy that his can is advanced not retarded

 

[Boomdeeze]

Ok so I did adjust my gears correct then. I turned my exhaust 2 notches to the left(Retarded), and my intake 2 notches to the right(Advanced).

Thanks for clearing that up Justin.

 

[dsmarmy777gst]

Tell me why Kelfords, HKS, GCS, Comp all have good vacuum when you throw the cam in. I haven't had any problems with the hks 272 regrinds but the 274 seems to be the problem regrind.

Yeah I agree. So far everyone i know with the 274 regrinds has nothing but problems


And thanks for clearing it up Justin! Its kind of confusing without looking at the actual cam gear haha I had it backwards in my mind, not on the car. Obviously i was looking at it the wrong way.

 

[JusMX141]

Like I said, if the hash marks are on the gear instead of the base, the A and R will be on opposite sides than if the hash marks are on the base instead of the gear....even though you're still turning the base the correct direction to advance the timing, which is the direction of engine rotation.

 

[Boomdeeze]

Any update on how these cams are performing after you fixed your gears again?

 

[Sandman817]

How are these cams performing with the timing adjustments??

 

[dsmgsx98]

My gears will be here tomorrow so if I have some time ill throw them on and post back.

 

[rocafellafw]

Great, I hope the adjustments get rid of my terrible brakes, low rpm chugging, and help my terrible gas mileage ( I feel like I have no low end power and have to give it more gas to get rolling).

 

[dsmgsx98]

Great, I hope the adjustments get rid of my terrible brakes, low rpm chugging, and help my terrible gas mileage ( I feel like I have no low end power and have to give it more gas to get rolling).

I hope it clears all that stuff up too, if not I am really going to be pissed about buying gears for nothing!

 

[dsmgsx98]

So Guy I got the gears from gave me the wrong tracking number and is being sketchy as shit so no telling when I will get the gears if I even get them at all. ..I used PayPal so ill get my money back if he keeps playing games

 

[dsmarmy777gst]

I hope it clears all that stuff up too, if not I am really going to be pissed about buying gears for nothing!

i'll guarantee you those gears are worth it! My car runs so much better since I adjusted them. I haven't got to play with them since because I was installing my stm tank to rail fuel line replacement and my damn line broke off my fuel pump assembly. I hope to get that fixed this week.

 

[Boomdeeze]

Dam seems like right when we are about to get some more info on how they are performing, something happens.

 

[dsmgsx98]

Dam seems like right when we are about to get some more info on how they are performing, something happens.

Did something else happen?? I finally talk to the guy who sold me the gears they should be here today, he gave me a tracking number to some other parts he sent out. Ill let you know when i get them!

 

[Boomdeeze]

Ok I wanna know how these perform after the adjustments at WOT. I am a few months away from finishing my car so I wont be able to test them until mid summer.

 

[dsmgsx98]

So i go my gears yesterday i should have them installed this weekend and adjusted

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[Boomdeeze]

So do you have them installed?

 

[dsmgsx98]

So do you have them installed?

Sorry bro I had to do stuff around the house for my ol lady, you know the regular "honey do" list shit. I will for sure have them installed in the next few days. Sorry again for the hold up

 

[dsmgsx98]

So these gears did nothing I have worse vac now and it is set -2 ex and +2 in and sounds worse than before

 

[dsmgsx98]

Anybody have any ideas? Maybe the shims are keeping the valves open?!?

 

[Boomdeeze]

Dam so you have worse vac now? Are you sure you turned them the correct way?

 

[dsmgsx98]

Yeah bro I tried a couple settings. -4ex +2in , -2ex+4in , 0ex +2in, +2ex 0in , 0ex-2in they never once changed my vacuum so I am pulling them out Saturday putting the stockers back in and shipping them to john at Delta so he can regrind them to a 272

 

[Boomdeeze]

Maybe you have a problem other than just the cams.

 

[dsmgsx98]

Maybe? But that was the only thing done to the car at that time... 1 hour before these cams went in it had -20 vacuum ...that's why I asked if shims could keep my valves open and john said no so he said pull them and ship them to me

 

[johnmarines]

I would think the bigger the cam the lower the vacumme would be. I have 275's and have -8 of vacuume at idle.