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Komissar Samba Member
Joined: May 18, 2008 Posts: 894 Location: Bucharest, Romania
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Posted: Mon Mar 30, 2009 10:13 am Post subject: Max rpm. ? |
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Hello,
I have searched this, but to no avail...
What are the maximal practical RPM's for an 40HP - STOCK - engine ?
As well for a 1300 , 1500 and 1600 dual and single ports ... all stock
THANKS _________________ 1965 Sunroof Beetle
1972 Type 3 Squareback
1978 Skoda 105S |
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sactojesse Samba Member
Joined: November 21, 2006 Posts: 2655 Location: Sacramento, California, USA
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Posted: Mon Mar 30, 2009 11:13 am Post subject: |
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A stock non-counterweighted crank is good for only 4,500 to 5,000 rpm maximum. However, as a practical matter, you will start losing power before then. If you look through the owner's manuals available here, you will find that the 40 hp made peak power at 3,900 rpm, the 1300 at 4,000 rpm, the 1500 at 4,200 rpm, and the 1600 SP and DP at 4,400 rpm. Thus, as a practical matter, there's no need to rev much over 4,500 for any stock engine, as hp begins to drop off before then. _________________ 1966 Karmann-Ghia convertible |
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Eaallred Samba Member
Joined: May 18, 2003 Posts: 5756 Location: West Valley City, Utah
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Posted: Mon Mar 30, 2009 11:22 am Post subject: |
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Built and tuned correctly, a stocker can drive and maintain 4000rpm for extended periods.
My old 63 buS got 31.1 mpg doing 4000rpm @ 65mph on its last long highway drive. They really seem to sing at that rpm. _________________ Eric Allred
You have to remember something: Everybody pities the weak; Jealousy you have to earn. |
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DarthWeber Samba Member
Joined: November 24, 2007 Posts: 7543 Location: Whittier,CA
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Posted: Mon Mar 30, 2009 11:41 am Post subject: |
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4500 |
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mharney Samba Member
Joined: June 01, 2002 Posts: 8353
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Posted: Mon Mar 30, 2009 12:27 pm Post subject: |
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4501. The price is right! |
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bugninva Samba Member
Joined: December 14, 2004 Posts: 8858 Location: sound it out.
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Posted: Mon Mar 30, 2009 12:28 pm Post subject: |
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4572 _________________
[email protected] wrote: |
With a show of hands, who has built over 1000 engines in the last 25 years? Anyone? |
GEX has. Just sayin |
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mharney Samba Member
Joined: June 01, 2002 Posts: 8353
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Posted: Mon Mar 30, 2009 12:31 pm Post subject: |
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[Drew looks at Chris ominously] "Are you sure?" |
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miniman82 Samba Swamp Donkey
Joined: March 22, 2005 Posts: 9515 Location: Southern Maryland
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bugninva Samba Member
Joined: December 14, 2004 Posts: 8858 Location: sound it out.
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Posted: Mon Mar 30, 2009 1:04 pm Post subject: |
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yep _________________
[email protected] wrote: |
With a show of hands, who has built over 1000 engines in the last 25 years? Anyone? |
GEX has. Just sayin |
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Jeff Gill Samba Member
Joined: December 17, 2007 Posts: 77 Location: Dover,Pa
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Posted: Mon Mar 30, 2009 2:39 pm Post subject: |
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My stock uncounterweighted crank went to 7,000 all the time but 8,400 ONCE!!!!!! |
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KooK Samba Member
Joined: April 15, 2005 Posts: 202 Location: Des Moines, IA
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Posted: Mon Mar 30, 2009 3:26 pm Post subject: |
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Jeff Gill wrote: |
My stock uncounterweighted crank went to 7,000 all the time but 8,400 ONCE!!!!!! |
Don't buy used engines from Jeff...
Check. |
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Jeff Gill Samba Member
Joined: December 17, 2007 Posts: 77 Location: Dover,Pa
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Posted: Mon Mar 30, 2009 5:32 pm Post subject: |
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Flywheel came loose after that, bearings and crank where still good though. Im not saying it is the correct thing to do but when your young and dont have the money, you tend to do things like that, and I dont sell them |
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ALB Samba Member
Joined: August 05, 2008 Posts: 3483 Location: beautiful suburban Wet Coast of Canada
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Posted: Mon Mar 30, 2009 7:00 pm Post subject: |
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Jeff Gill wrote: |
Flywheel came loose after that, bearings and crank where still good though. Im not saying it is the correct thing to do but when your young and dont have the money, you tend to do things like that, and I dont sell them |
I think Kook was just being funny. _________________ On a lifelong mission to prove (much to my wife's dismay) that Immaturity is Forever!! |
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gottdi Samba Member
Joined: February 05, 2009 Posts: 47
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Posted: Wed Sep 17, 2014 6:17 pm Post subject: |
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A stock crank can be balanced to 8000 rpm without the need for counterweights. Why use them if you don't need them. The cranks are forged and quite able to handle that speed. But in stock mode, 4200 should be about right so you don't pound out your bearings. |
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15309 Location: Deep in the 405
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Posted: Wed Sep 17, 2014 8:02 pm Post subject: |
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Stock valve springs can't handle over 4500 RPM's either. _________________ 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 |
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