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sconord
Samba Member
Joined: February 22, 2005
Posts: 704
Location: Dallas Texas
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 Posted: Wed Apr 09, 2008 7:26 am Post subject: 25hp lack of power |
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I need to know what degree of advance to set the timing of a 25hp. It is correct with a 25 hp distributor.
Thanks, Stan
Last edited by sconord on Thu Apr 10, 2008 1:43 pm; edited 1 time in total |
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sconord
Samba Member
Joined: February 22, 2005
Posts: 704
Location: Dallas Texas
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tasb
The Distributor Distributor
Joined: April 27, 2002
Posts: 6854
Location: Pentwater, Michigan
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| Posted: Wed Apr 09, 2008 8:40 pm Post subject: |
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not so fast...
the 383 would have been set at 7.5 BTDC static... |
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Suboval
Samba Member
Joined: September 15, 2003
Posts: 825
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| Posted: Thu Apr 10, 2008 9:15 am Post subject: |
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| My Split Manual (Section E, page 5-3) says 5 degrees BTDC static for a VE 4 BRS 383. |
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sconord
Samba Member
Joined: February 22, 2005
Posts: 704
Location: Dallas Texas
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| Posted: Thu Apr 10, 2008 1:19 pm Post subject: |
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I am having a lack of top end "power". I thought it might be timing.
I had to take the 1-2 head off for an oil leak in one of the lifter tubes. After putting it back in, it idles fine but lacks the power that it DID have.
I rechecked the vavle gap and checked for an intake leak and both no problems. I am thinking now either dirt in the carb or compression leak. I can't hear any kind of compression leak noise.
Last edited by sconord on Thu Apr 10, 2008 1:45 pm; edited 1 time in total |
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Splitdog
Samba Split Personality
Joined: February 16, 2004
Posts: 4149
Location: Planet VW
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| Posted: Thu Apr 10, 2008 1:40 pm Post subject: |
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Engines should be timed at max advance. I'm not sure about a 25 hp, but my stock 1600dp is set at 40 and runs fine. (@ 3000 rpm) Let static timing fall where it may. Unless it pings or hard to start-back it down.
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Z = z² + C
Der Blitzkrieg Kafers
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johnshenry
Samba Member
Joined: September 21, 2001
Posts: 9417
Location: Northwood, NH USA
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| Posted: Thu Apr 10, 2008 4:39 pm Post subject: |
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Re torque the head bolts (nuts) on the side you took off. Sometimes after running for a bit they can get loose and cause a loss of compression.
Also check the plugs and see if there is any differences in color on the tips side to side..
If you find something, let us know!!
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John Henry
'57 Deluxe
'56 Single Cab |
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DDub
Samba Member
Joined: January 06, 2005
Posts: 320
Location: central pa.
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| Posted: Thu Apr 10, 2008 4:58 pm Post subject: compression |
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| Why not just use a gauge and know for sure? |
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53 0val
Samba Professor
Joined: July 03, 2003
Posts: 11396
Location: Irvine, CA
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| Posted: Thu Apr 10, 2008 5:44 pm Post subject: |
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Put 40lbs of air in the tires and you will get the "biggest" speed improvement. 
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"What a fool believes he sees, no wise man has the power to reason away." Dobee, Dobee, Do |
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Brezelwerks
Samba Member
Joined: March 17, 2003
Posts: 1421
Location: Tyngsboro, MA
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| Posted: Fri Apr 11, 2008 9:17 am Post subject: |
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| Once you check the other stuff mentioned above, you may also need a distributor rebuild, might be a flat spot at higher rpms, may be worth having it curved at Vintagewerks to see how it matches up to the factory curve, then it can be adjusted as needed. |
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Seb67
Samba Member
Joined: December 02, 2003
Posts: 1012
Location: New England
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| Posted: Fri Apr 11, 2008 11:03 am Post subject: |
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In circumstances such as these I find it very amusing that you may actually have a horse power rating in the teens. 
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1964 Type 1 |
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dogapult
Samba Member
Joined: April 28, 2006
Posts: 552
Location: Qiryat Motzkin, Israel/ Allentown, PA
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| Posted: Fri Apr 11, 2008 1:53 pm Post subject: |
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25hp IS a lack of power! 
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I can haz beetle?
1963 Type 1:"Ellie"
gzg1406: "bamboo sounds almost like manboob" |
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52HoffmanSplit
Samba Member
Joined: April 07, 2006
Posts: 1276
Location: Lamorinda CA
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| Posted: Sat Apr 12, 2008 12:50 am Post subject: |
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| vwpimpster wrote: |
| 25hp IS a lack of power! |
But the cool factor is HIGH... like... Off the scale High.... just drove mine tonight.... smooth as can be.... 55 up the little rolling hills, 69 down the little rolling hills and 65 top Speed on the Flats..
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11/1966 Porsche 912
7/1968 Type 265 Double Cab
4/1955 Type 117 - 3 Fold |
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Eric Outland
Samba Member
Joined: January 22, 2004
Posts: 407
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| Posted: Sat Apr 12, 2008 11:35 am Post subject: Eric (VMR) |
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Did you replace the Cylindrical o-ring seal on the head/ barrel I hope? did you have the slit on the seal ring facing the right way? Have you done a compression check?
Check your advance, and do a static time with a lite. Retorque manifold and head and check valve adjustment.
If you do have loss of compression and all was fine before you removed the head for the leak--check your bently and do the oil cylindrical test to trouble shoot possibilites on bad valve, broken ring etc.etc. |
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splitjunkie
Samba Member
Joined: April 04, 2006
Posts: 4216
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| Posted: Sat Apr 12, 2008 3:28 pm Post subject: Re: Eric (VMR) |
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| Eric Outland wrote: |
| Did you replace the Cylindrical o-ring seal on the head/ barrel I hope? did you have the slit on the seal ring facing the right way? |
Those o-rings are not the primary seal. The junction between the top of the cylinder and the head is what forms the seal. The o-ring is just there as a fail safe to prevent exhaust gases from getting into the car since the heat is generated by the cooling air blowing over the cylinders and heads.
VW did away with the copper o-rings shortly after going to the fresh air heating system.
If the mating surface is suspect you can take the cylinders off and using valve lapping compound you can lap the cylinder to the head. That will ensure a perfect seal.
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Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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sconord
Samba Member
Joined: February 22, 2005
Posts: 704
Location: Dallas Texas
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| Posted: Wed Apr 16, 2008 3:06 pm Post subject: |
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I retorqued the head nuts.
I replaced the throttle cable which was wrapped around the clutch cable- shortening it about 1 1/2".
Seems to have solved the problem |
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iamdonquixote
Samba Member
Joined: January 28, 2003
Posts: 2087
Location: M*ssholia
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| Posted: Thu Apr 17, 2008 9:26 am Post subject: |
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| custom rev-limiter! |
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