ratio rockers....

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 13 Oct 2005, 2:45 pm

#417076

can someone please explain ratio rockers to me?

what do they do exactly?

how do they do it?

are they worth it on a stock engine?

what would be the ideal ratio for a stock single port 1600?

any other mods that need doing if u whack some on?

how much for a set?

Nick

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

MickH Hairy Gutted Sloth

3,389 posts · joined Sep 2003 · 13 Oct 2005, 2:56 pm

#417080

http://aircooled.net/gnrlsite/resource/articles/t1hpeng.htm

tssnq.com.au

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 13 Oct 2005, 3:53 pm

#417108

ok so i need longer push rods if i get ration rockers yes?

how much are they worth?

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 13 Oct 2005, 4:22 pm

#417124

http://forums.aussieveedubbers.com/viewthread.php?tid=44549&page=1#pid415282

yes - you need to set the geometry of the rockers

Have to make sure the spring doesnt bind.
The cam must be compatible with ratios.
Standard cams are

Futue te ipsum!!!

karmannghia60 Karmann Ghia Sucker

1,459 posts · joined Aug 2002 · 14 Oct 2005, 8:48 am

#417409

I wouldn't bother with them from my personal experience. I bought a set (and they are not cheap) of 1.25. Bolted them on a 1600SP. Felt no power increase like claimed by some (bolt on horse power). Two weeks later, one of the bolts holding the rocker shaft to the head snapped. Had to remove the head to get it fixed. Waste of time and you won't get much if any improvement.
Raf

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 14 Oct 2005, 8:56 am

#417413

ok thanks for the advice guys

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

OvalGlen Custom Title Time!

1,361 posts · joined Aug 2002 · 15 Oct 2005, 7:07 pm

#417814

cant give you a before and after comparison.
I built the engine with 1.4:1 , ok its a 1916cc
with very close to standard cam, low compression
and at the moment 34 pict carb.
I think that they give my engine good pulling grunt
but I suppose 1.9 L would anyway.
They have done thousands of miles with an absolute
maniac driving, without any problems.
I check tappets regularly and would say that normal
adjustments required - no problems there.
The reason I wanted them is to give flow when I get it on Boost.
:thumb

Regards,Glenn>