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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
I imagine the ports and intake valves look similar?
Scott
Heads have 80K on them but were removed from one bike and installed on another at 15000 miles. Heads were cleaned up at 15k and inspected, seals replaced and a quick seat seat / valve cut.. These heads have been on the bike for 65K.. TB was installed 30-40K ago..
Did not leak but CCP was 185 both cylinders @ 1000 ft alt. These are one step cooler plugs then stock. I could go back the stock heat range. Motor burn around 1/4 qt in 2500 to 5000 miles. Plugs have somewhere between 10-20K on them..
'Have 39k on the SE 58 in the 117, looks nothing like that... Cali Gas??
So what doe it look like?? I expect that some of this is simply reversion kicking back the slightest bit of oil and possibly additives in the gas.. Bike was only 9.9 to 1 with a W777 cam.. The problem is that anything that is blown back don't get washed off.
BTW, I should add is that the front part of the throttle blade looked clean. Only the back side has the crud. Is the SE 58 you are using one piece or 2.. On your bike, did you look at the back side? TBW I'd guess you'd have to pry it open.. Did you pull the throttle body? Did you look down into the manifold..
Last edited by Max Headflow; Jun 5, 2017 at 07:24 PM.
Reason: add.
So what doe it look like?? I expect that some of this is simply reversion kicking back the slightest bit of oil and possibly additives in the gas.. Bike was only 9.9 to 1 with a W777 cam.. The problem is that anything that is blown back don't get washed off.
BTW, I should add is that the front part of the throttle blade looked clean. Only the back side has the crud. Is the SE 58 you are using one piece or 2.. On your bike, did you look at the back side? TBW I'd guess you'd have to pry it open.. Did you pull the throttle body? Did you look down into the manifold..
Agree about the reversion (what else could it be?? vented to ground).
Very little of that crud, virtually none on the backside of the Throttle Plate,, just some small flecks in bottom of the intake tract... No where near covered like yours appears to be...
TB is a 1 piece,,, Have a USB Borescope on a wand that doubles back on itself,,,
got it for $45 two years ago when they were first coming out,,, works great! very handy!
TBW, I did pry it open,,, gently, slowly, with the key off,,, didn't feel like I put any undue stress on the gears still working fine...
looked all the way to both of the Intake valves...
T-Man 625s at 10.4, similar oil consumption as you...
T-Man CVO Street Performer Heads same miles as TB, just short of 40k...
TB has pronounced "cluck" at idle,,, dead nuts Quiet otherwise...
I asked if you thought it might be the differences in the Gas? since our miles on TBs / oil consumption are close?? Maybe you're having more oil consumption from Guides (more miles on Heads) and me from Rings??
Agree about the reversion (what else could it be?? vented to ground).
Very little of that crud, virtually none on the backside of the Throttle Plate,, just some small flecks in bottom of the intake tract... No where near covered like yours appears to be...
TB is a 1 piece,,, Have a USB Borescope on a wand that doubles back on itself,,,
got it for $45 two years ago when they were first coming out,,, works great! very handy!
TBW, I did pry it open,,, gently, slowly, with the key off,,, didn't feel like I put any undue stress on the gears still working fine...
looked all the way to both of the Intake valves...
T-Man 625s at 10.4, similar oil consumption as you...
T-Man CVO Street Performer Heads same miles as TB, just short of 40k...
TB has pronounced "cluck" at idle,,, dead nuts Quiet otherwise...
I asked if you thought it might be the differences in the Gas? since our miles on TBs / oil consumption are close?? Maybe you're having more oil consumption from Guides (more miles on Heads) and me from Rings??
???
It's really don't think it's an oil consumption issue.. Like you agree oil consumption was not that high.. One thing that I would suspect is the ECM and injector timing.. It may be off.. It may also be a bit of a deficiency on how injector timing is controlled by the ecm.. This bike runs a TMAX.. Injector timing on it is pretty simplistic and for general running typically not an issue. I believe that TMAX sets injector end timing at a fixed value and it's a short time at or slightly after TDC overlap. The fuel is dumped onto the back side of that valve all the time and as far as I know the timing doesn't change.. Some of that fuel is blowing back into the throttle body.. The Delphi tuners will change injector timing RPM and I think based on load / map also..
It's really don't think it's an oil consumption issue.. Like you agree oil consumption was not that high.. One thing that I would suspect is the ECM and injector timing.. It may be off.. It may also be a bit of a deficiency on how injector timing is controlled by the ecm.. This bike runs a TMAX.. Injector timing on it is pretty simplistic and for general running typically not an issue. I believe that TMAX sets injector end timing at a fixed value and it's a short time at or slightly after TDC overlap. The fuel is dumped onto the back side of that valve all the time and as far as I know the timing doesn't change.. Some of that fuel is blowing back into the throttle body.. The Delphi tuners will change injector timing RPM and I think based on load / map also..
Sounds like that's it,,, Makes sense...
fwiw; my '09 has OE Delphi ECM Tuned w/ Techno Research Direct Link.
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still working fine...
