Slant Six Forum
https://slantsix.org/forum/

Hughes cam
https://slantsix.org/forum/viewtopic.php?t=59076		 Page 1 of 1
Author:  225kid [ Sat Feb 06, 2016 8:02 pm ]
Post subject:  Hughes cam
Has anyone put the hughes whiplash slant six cam in?
Author:  DusterIdiot [ Sun Feb 07, 2016 3:36 am ]
Post subject:  No but...
Looks like they ground them for header builds not slant six... The pattern should have more duration on the intake than the exhaust since the cylinder fill is lazy on the slant, but exhaust event is efficient...

With those lifts they would probably work fine for a turbo...I would expect more duration for the lift they give...something line 220+ @ .050 for a .483 lift, and something at least 240 for lifts above .500....

I like how they tell you that the vacuum is low and what gearing but don't tell you what static or dynamic compression ratio will make it work efficiently, and you may need to play with the lobe separation for best torque results...grinding it at 5 degrees advanced isn't big...grinding it straight up and advancing the cam centerline closer to 100-104 would be better.


Before cam shopping, you have to have a goal in mind, an idea of what to do to the engine and your tranny, brakes, gearing, so you can hone in on your cam choice.

:wink:
Author:  Dart270 [ Sun Feb 07, 2016 4:29 am ]
Post subject: 
Can someone post the specs for this, or a link to the spec page?

Thanks,

Lou
Author:  ProCycle [ Sun Feb 07, 2016 7:26 am ]
Post subject: 
Image
Author:  Dart270 [ Mon Feb 08, 2016 4:12 am ]
Post subject: 
Thanks for posting. Weird choice on int/exh duration...

Lou
Author:  DusterIdiot [ Mon Feb 08, 2016 6:15 am ]
Post subject:  x2
Quote:
Weird choice on int/exh duration...
Yep...valve lash is like comp cams, and feels like a repurposed chevy lobe...
Author:  Rick Covalt [ Wed Feb 10, 2016 1:43 pm ]
Post subject: 
Quote:
grinding it at 5 degrees advanced isn't big...grinding it straight up and advancing the cam centerline closer to 100-104 would be better.
Is it possible to explain this in a way that a monkey with an average IQ could understand? I want to learn if I can. Thanks DI. :lol: :lol: :lol: :lol:
Author:  Joshie225 [ Wed Feb 10, 2016 2:17 pm ]
Post subject: 
It's been empirically proven that slant 6 race cars with more intake duration than exhaust duration go faster than those with a single pattern cam. It has also been shown that advancing the cam makes the car faster and that 102° +/- 2° intake center-line is best (quickest). Having the cam ground advanced to 103° intake center-line is fine, but doesn't necessarily get you where you want to be.
Author:  DadTruck [ Wed Feb 10, 2016 2:25 pm ]
Post subject: 
well, to compare that Hughes cam to the regrind that I put on the cam in the 83 D150,,

and I was building for low RPM torque

@ .050 Intake valve closed which most folks agree is the single most important cam characteristic,, at a 103 ICL,, both the Hughes cam and the Oregon 1333 I am using, on the intake side have a .050 IVC at 28 degrees ABDC

so that leads me to think that particular Hughes is a low - mid range torque cam,,

the Chevy references are because that particular Hughes cam has more duration on the exhaust than the intake, fitting for an over square motor with more piston diameter than stroke like a SBC...may not be the best choice for an under square motor like a slant six.

the Hughes cam does have a good amount of lift, so that can be added to the mix,,but typically duration defines a cam.

just looking at the .050 duration numbers
I am running a 212 and 206 @ .050
The Hughes is 210 and 224 @ .050
Page 1 of 1 All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/