| Author |
Message |
vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
|
 Posted: Fri Sep 14, 2007 5:08 am Post subject: |
 |
|
The stock non-counterweighted crank starts flexing and pounding out the thrust bearing surfaces at around 4500 RPM's. If you never plan on turning it over 4500, then a stock crank is fine. An Engle W110 cam will pull to 5500 RPM, so I strongly recommend a counterweighted crank.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
|
| Back to top |
|
 |
Rowroy
Samba Member
Joined: November 07, 2006
Posts: 1012
Location: The ass of nowhere
|
| Posted: Fri Sep 14, 2007 10:13 am Post subject: |
|
|
| vwracerdave wrote: |
| The stock non-counterweighted crank starts flexing and pounding out the thrust bearing surfaces at around 4500 RPM's. If you never plan on turning it over 4500, then a stock crank is fine. An Engle W110 cam will pull to 5500 RPM, so I strongly recommend a counterweighted crank. |
That makes perfect sense. I might as well utilize the entire power band that the cam is capable of producing.
Thanks 
John
_________________
Suicide is man's way of telling God, "You can't fire me; I quit!" - Bill Maher |
|
| Back to top |
|
|
gerico
Samba Member
Joined: May 20, 2004
Posts: 322
Location: Carlsbad, CA
|
| Posted: Fri Sep 14, 2007 5:24 pm Post subject: |
|
|
John,
I'll second vwracerdave and matthew. If you plan on reving 5,000 or higher a counterbalanced crank is definitely the way to go. Also be sure and use high performance valve springs and get the rotating assembly balanced (including the clutch plate). You won't need dual springs but you WILL need springs w/ higher pressure than stock to prevent valve float. It's also a good idea to full flow the oil pump and add an external oil filter.
_________________
`70 street Ghia, 2276 NA
Thanks to:
Darren at DRD Racing
Jason at VW Paradise
Bill at Shear Speed
Kevin at KCR trans |
|
| Back to top |
|
|
|
