SE255 cams with +4/-4 gear
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Tourer
Joined: May 2007
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SE255 cams with +4/-4 gear
I have been trying to fix my detonation issues for a few weeks now and cannot seem to cure it without retrading my timing so far that my performance is suffering. I was looking at getting a new cam such as the TW6 but now I am wondering if I can use a +4 gear to push out the intake closing 4 degrees and cure it all together and keep the 255 cams.
Thoughts?
Also is woods the only company that makes the +4 gear?
Thoughts?
Also is woods the only company that makes the +4 gear?
Cruiser
Joined: Apr 2009
Posts: 114
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I have been trying to fix my detonation issues for a few weeks now and cannot seem to cure it without retrading my timing so far that my performance is suffering. I was looking at getting a new cam such as the TW6 but now I am wondering if I can use a +4 gear to push out the intake closing 4 degrees and cure it all together and keep the 255 cams.
Thoughts?
Also is woods the only company that makes the +4 gear?
Thoughts?
Also is woods the only company that makes the +4 gear?
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Tourer
Joined: May 2007
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From:
As far as getting it dyno tuned....... I have absolutely no faith in any of the tuners in my area. I have been tuning witht he TTS tuner, I have my fuel set and my timing I have been retarding it to control the detonation, what else is there other than the fuel and timing?
Road Warrior
Joined: Jun 2007
Posts: 1,788
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From: Here
I think Andrews makes a gear as well, but you would want to go -4, not +4. If you went +4 (advanced), that would close your intake even earlier and increase your ccp. AFAIK, timing and fuel quality given a certain engine compression are the biggest factors that will affect your detonation. Higher ccp and leaner afr's **typically** require you to retard the timing to prevent detonation. What may seem like pulling out a lot of timing might not really be the case. It might just be what the engine needs.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
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From: Baton Rouge, LA
Well according to several..... with the early closing of the intake on the 255 cams I am getting very early compression thus detonation. I have around 10:1 comp with I understand is the top limit of the 255 cams. With the +4 gear it should move the closing of the intake out 4 degrees which would make the compression start at a later point thus hopefully getting rid of my detonation? I know some have said I should be able to tune out the detonation which I have, but my feeling is by retarding the timing drasticaly it is not the correct fix.
I would adjust advance rather than hacking further on the motor. Where are you hearing detonation? Roll-on at low RPM's or WOT at higher revs?
As far as getting it dyno tuned....... I have absolutely no faith in any of the tuners in my area. I have been tuning witht he TTS tuner, I have my fuel set and my timing I have been retarding it to control the detonation, what else is there other than the fuel and timing?
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Tourer
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Yea sorry I stated the direction incorrectly for the gear.
As far as the detonation.... I was hearing it all over the place, high RPM's under WOT, lower RPM's while lugging although not too bad and even under light throttle while cruising at 3000. I have tuned most of the pinging out but I have had to remove as much as 11 degrees timing in some areas.
I was trying to figure out a way to resolve this a little cheaper than new cams and pushrods but it may not be able to happen. Again I do understand that "some" have been able to run higher compression with these cams but several including Doc, and Mike at Latus have said that much over 9.5:1 will most likely cause problems with these cams.
As far as the detonation.... I was hearing it all over the place, high RPM's under WOT, lower RPM's while lugging although not too bad and even under light throttle while cruising at 3000. I have tuned most of the pinging out but I have had to remove as much as 11 degrees timing in some areas.
I was trying to figure out a way to resolve this a little cheaper than new cams and pushrods but it may not be able to happen. Again I do understand that "some" have been able to run higher compression with these cams but several including Doc, and Mike at Latus have said that much over 9.5:1 will most likely cause problems with these cams.
Road Captain
Joined: Feb 2006
Posts: 739
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Duke:
I would highly recommend a call to John (Herko) here:
http://www.flyingwperformance.com/
He has a ton of experience with the SE255s! Great guy to talk with. Also a TTS Tuner/Dealer.
BTW: There's more going on than just "fuel and timing".
I would highly recommend a call to John (Herko) here:
http://www.flyingwperformance.com/
He has a ton of experience with the SE255s! Great guy to talk with. Also a TTS Tuner/Dealer.
BTW: There's more going on than just "fuel and timing".
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Elite HDF Member
Joined: Jan 2008
Posts: 4,351
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From: Illinois
I don't have as much experience as you and many others have on this forum about building motors, but I am very sure that the 255 cams are not your problem. It is the tune.
I had more problems than solutions with my 103" kit and 255 cams before I found a great tuner. I would rather make a long trip to a good tuner than hack at the motor for a solution that may or may not work because you still have a bad tune.
What better excuse for a road trip?
Dennis
edited to add............... We don't know what your location is. If you would share a general area it is very possible that someone could tell you about a great tuner that isn't all that far from you that you don't know of.
I had more problems than solutions with my 103" kit and 255 cams before I found a great tuner. I would rather make a long trip to a good tuner than hack at the motor for a solution that may or may not work because you still have a bad tune.
What better excuse for a road trip?
Dennis
edited to add............... We don't know what your location is. If you would share a general area it is very possible that someone could tell you about a great tuner that isn't all that far from you that you don't know of.
Last edited by rochkes; Jul 15, 2009 at 03:31 PM.
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