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Web 251 camshaft advance?
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Topic: Web 251 camshaft advance? (Read 5435 times)
neil68
Hero Member
Posts: 538
Web 251 camshaft advance?
«
on:
June 24, 2015, 19:06:42 pm »
I'm going to install a Web 251 camshaft that I've had for a few years. Will also bump up the CR to 11:1.
Should I install the cam straight up, or advance it 2 degrees, 4 degrees, etc? I want to try it out primarily for the drag strip.
Anyone have experience with this cam? The specs are similar to an FK89, as far as I can tell.
Thanks!
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Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:
https://www.youtube.com/watch?v=M9B_H3eklAo
LGK
Full Member
Posts: 142
Re: Web 251 camshaft advance?
«
Reply #1 on:
June 25, 2015, 07:10:42 am »
Quote from: neil68 on June 24, 2015, 19:06:42 pm
I'm going to install a Web 251 camshaft that I've had for a few years. Will also bump up the CR to 11:1.
Should I install the cam straight up, or advance it 2 degrees, 4 degrees, etc? I want to try it out primarily for the drag strip.
Anyone have experience with this cam? The specs are similar to an FK89, as far as I can tell.
Thanks!
«
Last Edit: July 06, 2015, 15:52:15 pm by LGK
»
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neil68
Hero Member
Posts: 538
Re: Web 251 camshaft advance?
«
Reply #2 on:
June 25, 2015, 19:41:59 pm »
My current Raptor 06908 camshaft has more lift (10.8 mm/0.425") than the Web 251 (10.7 mm/0.420").
However the Raptor has a shorter duration (274 degrees @ 1.27 mm/0.050"). So I was looking at the advantage of having the intake valve open a bit longer with the Web 251 (285 degrees).
As it turns out, I had forgotten that my Web 251 was incorrectly ground...I think they used the smaller Type 4 spec in error.
I might try another Raptor with more duration, but CSP seems to be out stock at the moment.
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Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:
https://www.youtube.com/watch?v=M9B_H3eklAo
Erlend / bug66
Global Moderator
Hero Member
Posts: 958
SCC Event
Re: Web 251 camshaft advance?
«
Reply #3 on:
June 26, 2015, 08:06:19 am »
Quote from: neil68 on June 25, 2015, 19:41:59 pm
My current Raptor 06908 camshaft has more lift (10.8 mm/0.425") than the Web 251 (10.7 mm/0.420").
However the Raptor has a shorter duration (274 degrees @ 1.27 mm/0.050"). So I was looking at the advantage of having the intake valve open a bit longer with the Web 251 (285 degrees).
As it turns out, I had forgotten that my Web 251 was incorrectly ground...I think they used the smaller Type 4 spec in error.
I might try another Raptor with more duration, but CSP seems to be out stock at the moment.
Buy one directly from Johannes?
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neil68
Hero Member
Posts: 538
Re: Web 251 camshaft advance?
«
Reply #4 on:
June 26, 2015, 20:41:49 pm »
Yes, I will, however the JPM website has been off line for a few days, and CSP only lists advertised duration, so I'll have to get additional information on what cams are available from Johannes.
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Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:
https://www.youtube.com/watch?v=M9B_H3eklAo
Erlend / bug66
Global Moderator
Hero Member
Posts: 958
SCC Event
Re: Web 251 camshaft advance?
«
Reply #5 on:
June 26, 2015, 22:51:15 pm »
Quote from: neil68 on June 26, 2015, 20:41:49 pm
Yes, I will, however the JPM website has been off line for a few days, and CSP only lists advertised duration, so I'll have to get additional information on what cams are available from Johannes.
Works fine for me;
http://www.jpmotorsports.se
He'll do any custom cam also.
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The '67:
10.626 @ 132mph, SCC 2016
10.407 @ 134mph, SCC 2017
10.221 @ 135mph, SCC 2018
The '59:
Not yet..
Kiel
Jr. Member
Posts: 99
Re: Web 251 camshaft advance?
«
Reply #6 on:
June 27, 2015, 15:49:08 pm »
I have the 251 i my 2,4 liter type 4 engine. 103mm x 71mm
comp is 11,5 and use jpm valve spring, run it to 8000 rpm. no problem with 48mm and 40mm type 4 valve.
The cam are set to o degress.
http://youtu.be/T0IsZAJPlgg
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Torben Alstrup
Hero Member
Posts: 716
Re: Web 251 camshaft advance?
«
Reply #7 on:
July 04, 2015, 12:50:23 pm »
If you decide on a 251 , and the engine is for drag mainly, I would set it up in zero (108 lc) It does not need more spring pressure than an FK89 due to a better opening and closing ramp. Power wise I couldnt say which is the better 251 versus FK89. But the 251 seems to have a cleaner idle and pulls a tad earlier. At least that is what I have noticed.
T
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