holset hx 40 build what cams

[240dsm]

im building a 2.0 hx 40 35+ psi weekend driver 8250 redline 272 280 or 288 cams

 

[Boostdclips99]

Ask the people pulling low vacuum, even on the "BC272s," when installed straight up out the box.

Quality Control is poor, its part of why the price is so much lower than everyone else.

I have a set. I've never seen a 272 cam keep stock vacuum out of the box. I've been running mine for 3 years now with no issues. Has a great powerband, pulls way past redline on my Green running 27psi. Can't complain for the price and I provided proof from an actual test done by a member.

 

[Thedsmnewbie]

stock 2.0 with just a set of bc272s in the stock head
hx40 in a bolt on housing
made 40psi by 5200-5300

car moved pretty good

Dang 40 with all stock parts????

 

[LandSpeed-DSM]

I have a set. I've never seen a 272 cam keep stock vacuum out of the box. I've been running mine for 3 years now with no issues. Has a great powerband, pulls way past redline on my Green running 27psi. Can't complain for the price and I provided proof from an actual test done by a member.

Two people "making some power" is not proof.. it means you two won the "blind man grinding a cam" lottery.

You just want to argue.. the QW print out is not negotiable.. that is excessive base circle run out. You won't find that on a JUN cam, or a Kelford/GSC/FP/HKS cam.

You will find it on Delta and BC cams though.. wonder why

I moved 67 lbs/min with acceleration vs. weight to back it up on a junk "prototype" DSMGraveyard cam.. their very first set of "274s" that I got for free to be a test mule.

Which is more than either of you.. that doesn't make it a good cam. But at least I am honest about it.

 

[cloead]

Dang 40 with all stock parts????

yeah building a block now but might end up running another stock block this season

 

[240dsm]

crower 288s it is

 

[viperlp01]

The worst part about this entire conversation is the fact that everyone refers to camshafts by there advertised duration. Rarely does someone put a brand next to the duration @ .001

 

[240dsm]

im still learning everyday i base cam shafts of where my rpms are gonna be most the time idk

 

[Boostdriven]

To the OP. When choosing cams you have to look at the actual duration of the cam. For example crower 272s according to the cam card at .050" (1.27mm) valve lift cam duration is 194* intake, 196* exhaust, total valve lift 9.93mm intake, 9.63mm exhaust. I ran those cams and honestly I thought they were good cams if you want a car that still spools good and has good mid range to red line power. My car pulled good to 8000 rpms.

Few years ago I switched to kelford 272s and I have to say that those are for sure different cams. According to the cam card at 1mm valve lift cam duration is 226* intake, 226* exhaust, total valve lift 11mm intake, 11mm exhaust. Last year when I ran 6 blade HX40 car made 580 awhp at 8000 rpms, 412 ft/lbs of torque at 7300 rpms 31 psi on pump gas with mater/meth, this was in 3rd gear.

So when we talk about 272s, 280s or 288s you have to look at the actual cam specs and not just their advertising number. I've looked at other cam specs and kelford 272s are bigger them most 280s out there.

If your planning on reving to 8500 rpms then any good quality cams that have similar specs as kelford 272s should do justice for you. You can get something with more duration and lift and potentially make more power at higher rpms (8000+) but the lose of spool up and mid range might not be worth it.

 

[Archer Fabrications]

You've almost sold me on those kelford 272/272s but personally lean toward GSC S2's i have an hx40 7 blade and after beehives think ill have a rev
Of 8.5k also.

Anything is better than my current BC 272's