Hey all
Its been ages since Ive posted, its good to be back. Im thinking of getting the 1087042 Crow cam. http://www.crowcams.com.au/templates/Catalogue-Sigma-OHC.shtml (http://www.crowcams.com.au/templates/Catalogue-Sigma-OHC.shtml). Just wondering if anyone has fitted this cam before and what they came across? I may need the 1087292 Im not too sure how to tell the difference between hydraulic lash adjusters and whatever else the astron 2 came out with. I think I may have a TR engine that may have been EFI but it is carby now, I think the efi engines had a 9.0cr and the carbs had a 8.8...not too sure. Anyway, the site says the cam doesnt suit efi engines, Im unsure if this means the heads in the efi are different and it wont fit or the computer in the efi wont like the cam.

What else will I need to purchase to change out the cams? I have only recently changed the cam in my falcon but thats a pushrod V8 so its going to be a bit different to an OHC 4. So far on the shopping list I have the cam, some cam lube, and a rocker cover gasket.

Will I need a new dizzy gear?

Will I have hydraulic lash adjusters?

Thanks, Matt.

Ok I just found this post about the std cam profile

(Posted by Stagma)

CAMSHAFT SPECIFICATIONS
Inlet Opens 25º BTDC
Inlet Closes 59º ABDC
Inlet Duration 264º
Exhaust Opens 64º BBDC
Exhaust Closes 20º ATDC
Exhaust Duration 264º
Overlap 45º
Inlet Cam Lobe Height 42.50mm
Exhaust Cam Lobe Height 42.56mm
Nominal Cam Lift 10.50mm

PART NO.VALVE TIMINGDUR.075" DUR.VALVE LIFTPOWER RANGECOMMENTS1077041
1087042IN.18/54
EX.54/18252
252204
204.454"
.454"2000
5800Mild street cam.107704T1
108704T2IN.14/58
EX.58/14252
252204
204.454"
.454"2000
6000Mild TURBO cam suit street application1077011
1087012IN.31/69
EX.70/30280
280230
230.460"
.460"3000
7000Hot cam for street/race performance in modified motor.107701T1
108701T2IN.29/71
EX.73/27280
280230
230.460"
.460"3000
7500Street / race turbo application1077291
1087292IN.23/57
EX.59/21260
260205
205.450"
.450"2000
5800Mild cam for use in engines with hydraulic lash adjusters. To april 1991(From Crowcams.com.au)

From that, it looks like the crow cam is smaller than stock (Except for about 1mm more lift)...surely this cant be true. What am I missing here?

crow cams would run on solid lifters... meaning the lift at the valve will be better than hydralic adjusters. also duration is at 0.75", not true duration.

you think crow are gonna give away their timings for nothing so people can regrind their cams?

wont need new dizzy. and it'd be best to run solid lifters. hydralic lifters dont like mild/hot cam profiles much.

cam will fit your head... efi and carby heads are the same.

id your motor is from a TR, you'll have roller rockers... doesn't matter, cos i'd suggest you go solid lifters from a sigma 2.6.


your shopping list is sounding good so far. definately a good idea with the assembly lube... you might need a filler guage to measure clearances for the solid lifters.

just dont use sigma spec they rattle like a *****

just dont use sigma spec they rattle like a *****

this would be because you are running the lifters on a hydraulic cam grind. also you will find the valves are shorter in hydralic lifter head (especially the roller rocker heads, the adjustment needs to be wound almost all to one side). also what clearances are you running atm?

if you wanna go a better than mild cam, you have to use the sigma lifters... hydraulic lifters hate the duration and lift. even with a mild cam, i'd suggest them. manual ones you adjust once and then one day when they start to come a bit rattly, adjust them again... the hydraulics are $4-5 each... but it's free to set the clearances again :P

yeh BCX7 is right
i am running sigma rockers with a custom cam for the manual lifters and the only time it slighly ticks is in the morning other then that you dont hear any ticking what so ever