Any benefits??

Message

tinganting · #1 Post by **tinganting** » Wed Jul 11, 2007 9:42 am

Hi.. looking for some advice.. what would be the benefits/downside of fitting hs8 carbs to a standard enginge with only mod being a lightened flywheel?? i ask as i am considering it..thanks

DavePoth · #2 Post by **DavePoth** » Wed Jul 11, 2007 9:50 am

Too much carb for the engine IMO, you only need the '8s for serious high rev breathing.

tinweevil · #3 Post by **tinweevil** » Wed Jul 11, 2007 9:54 am

Not a lot. HS6 will supply more than enough mixture for a standard cam to standard revs.

You only need bigger carbs if you need to supply a greater volume of mixture to the engine. This would be due to increased valve opening through increased lift or duration cam, bigger valves or through increased rev limit.

Increasing carb size without increasing flow rate can be detramental as the flow rate of the mixture falls. If the mixture flows too slowly the petrol literally falls out of the gas. Dave P has a BHP figure 2xHS6 are good too iirc.

Tinweevil

tinganting · #4 Post by **tinganting** » Wed Jul 11, 2007 9:58 am

ok ... thanks guys... so if i had a slightly ( better) cam then it maybe worth it butu no worth it now... umm. i only ask as i would love a little more go but not wreck the drivability of my car..thanks Chaps..

mahony · #5 Post by **mahony** » Wed Jul 11, 2007 11:12 am

on a slightly different note i had twin 45 webbers fitted to my standard sprint engine in the late eighties,there where no real performance gains in the lower rev range and a very slight increase at the top end. stick with the hs6's for alround driveability.

#6 Post by **Mad Mart** » Wed Jul 11, 2007 1:31 pm

I put HS8s on a standard Sprint. Waste of time. Could never get it to idle properly & pulling away was a mare. Once it hit about 3000rpm it took off but wasn't that much quicker than with HS6s. Not a nice car to drive.

DavePoth · #7 Post by **DavePoth** » Wed Jul 11, 2007 1:54 pm

tinganting wrote:ok ... thanks guys... so if i had a slightly ( better) cam then it maybe worth it butu no worth it now... umm. i only ask as i would love a little more go but not wreck the drivability of my car..thanks Chaps..

Fit a K&N filter (preferably the panel one in the airbox if you still have it, or the really deep round ones (bigger than rimmers suggest) if not, and then jet the carbs to suit. It'll be a worthwhile gain throughout the rev range.