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#1
Cam grind
dhadina
Posted on: 2016/3/16 18:48
Just after people's thoughts and opinions on an appropriate cam grind for my setup.
A15 with stock bottom end, arp rod bolts H89 head match ported to redline intake and ported exhaust side with L16 exhaust valves Double valve springs Twin side draught webers Looking for something with good mid to hi range power. Revving to about 7000rpm. Thanks
#2
Re: Cam grind
Volodkovich
Posted on: 2016/3/16 20:33
Have you milled the head for more compression?
#3
Re: Cam grind
dhadina
Posted on: 2016/3/16 20:46
the work hasnt been done yet but i assume it will be milled. so yes
#4
Re: Cam grind
Volodkovich
Posted on: 2016/3/17 2:54
Where are you looking at getting the cam ground? Most grinders will have a decent selection of masters to choose that will work well enough.
I'd go for something like 236 degrees @ 0.050" with around 7.6mm (.300") lobe lift, on 106 lobe separation. Just be careful with lift - make sure you have no coil bind on your valve springs. No need for dual pattern (different exhaust profile) for a simple build. A cam like the above will put your power in the 3500-6500 range so be fine for a 7000rpm shift.
#5
Re: Cam grind
ddgonzal
Posted on: 2016/3/17 3:06
Thats less than stock lift (which is 8mm , or 8.4 for A12GX engine), lose breathing if you don't open the valves fully
Stock cam is dual pattern Better to fit flat-top pistons than to mill the head. Because flatties give quench, milling the head does not
#6
Re: Cam grind
dhadina
Posted on: 2016/3/17 3:20
Won't be changing Pistons as bottom end is done. I'll be going to Clive cams in ferntree gully. Not sure what they offer. To be honest with you I don't really understand this whole cam business. Is there something from camtech that would be good. I can give Clive cams those specs.
#7
Re: Cam grind
ddgonzal
Posted on: 2016/3/17 3:50
Better to let Clive give you their recommended specs, they know more about cams than we do
#8
Re: Cam grind
Volodkovich
Posted on: 2016/3/17 4:51
ddgonzal, respectfully speak for yourself about what you know about cams. You have no idea about others.
The stock cam is 5.65/5.9mm lift at the cam = ~8mm valve. I called for 7.6mm at the cam (hence quoting lobe lift) = ~11mm at the valve, notwithstanding lash. dhadina, Tell Clive you want something around 232-236@0.050", .300" lobe lift on 106 centres. Tell them it is for an A series but if you want to get keen you can ask for a maximum of 25 inches per second seating velocities @ 7000rpm and a maximum cam profile velocity of 6.5 thou per degree. You don't want a dual pattern for a road car, the extra exhaust duration will loose you low down torque and is only really needed for top end power. Not worth it for a street motor.
#10
Re: Cam grind
Volodkovich
Posted on: 2016/3/17 19:51
No worries, just trying to help out with cam selection. Sorry if I sounded a bit short!
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