Author Topic: M8 Head High Performance Mod  (Read 671 times)

0 Members and 1 Guest are viewing this topic.

Offline PanHeadRed

  • Full Member
  • Posts: 1531
M8 Head High Performance Mod
« on: January 20, 2018, 04:45:59 PM »
How are the Singh grooves working on these?

Offline sbcharlie

  • Locked
  • Full Member
  • Posts: 233
Re: M8 Head High Performance Mod
« Reply #1 on: January 21, 2018, 05:29:20 AM »
i have seen this done on metric heads. the cut a groove between the intake valve side. i think its a waste of time

Online prodrag1320

  • Full Member
  • Posts: 4998
  • Country: 00
  • AHDRA & AMRA national champion & record holder
    • vee twin racing
Re: M8 Head High Performance Mod
« Reply #2 on: January 21, 2018, 05:42:02 AM »
 :agree:

Offline Thermodyne

  • Site Supporter
  • Full Member
  • *****
  • Posts: 298
  • Country: us
Re: M8 Head High Performance Mod
« Reply #3 on: January 21, 2018, 07:05:19 AM »
There is not a lot of quench surface in the M8 cylinder head, so the benefits for Singh grooves would be less on the M8 than say a Twin Cam.

But from what I have read, there is always a measurable benefit.  Not so much from a max power point of view, but from a fuel efficiency, and emissions reduction.  They show the most improvement with lean mixtures. 

The slots direct some of the air fuel mix to the center of the chamber, where it burns more efficiently.  Some people like to direct it at the exhaust valve, not sure exactly what the benefit is with that, could be cooling, or it could just be about venting it before compression.  The point is, that the slots show some improvment more or less in any configuration. 

The down side is the cost of installing them.  You cant just grint them in with a die grinder.  And they don't work well with wide production style quench gaps.  On the race car side of it, they are turning up factory machined into the pistons.   

Offline sfmichael

  • Site Supporter
  • Full Member
  • *****
  • Posts: 5386
  • Country: us
  • Hoping to build the next mighty 'mouse'
Re: M8 Head High Performance Mod
« Reply #4 on: January 21, 2018, 12:14:37 PM »
There is not a lot of quench surface in the M8 cylinder head, so the benefits for Singh grooves would be less on the M8 than say a Twin Cam.

But from what I have read, there is always a measurable benefit.  Not so much from a max power point of view, but from a fuel efficiency, and emissions reduction.  They show the most improvement with lean mixtures. 

The slots direct some of the air fuel mix to the center of the chamber, where it burns more efficiently. Some people like to direct it at the exhaust valve, not sure exactly what the benefit is with that, could be cooling, or it could just be about venting it before compression. The point is, that the slots show some improvement more or less in any configuration. 

The down side is the cost of installing them.  You cant just grint them in with a die grinder.  And they don't work well with wide production style quench gaps.  On the race car side of it, they are turning up factory machined into the pistons.

seems legit  :up:
Colorado Springs, CO.

Offline kd

  • Site Supporter
  • Full Member
  • *****
  • Posts: 5553
  • Country: ca
Re: M8 Head High Performance Mod
« Reply #5 on: January 22, 2018, 06:50:34 AM »
My research and understanding is the real benefit is the added turbulence in the combustion chamber. It can also aid in more complete burning of rich mixtures at lower RPM with cams that have a lot of overlap for high RPM power. I think one of the biggest problems with grooves is there is very little real scientific testing to document how and when they are useful. The one thing that is commonly agreed upon though is they don't hurt performance.   
KD