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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.
Cmon guys. Is there noone that has any ideas other than the obvious that I've already tried? Manual gauge, pressure relief spring, cam plate, etc.?
I am repeating myself but just because you have a manual gauge doesn't mean it is accurate. Manual gauges can read wrong out of the box just like electronic gauges. If you haven't pulled the cam plate and checked the piston movement in the relief valve bore, you don't know if it is sticking or not. Just because the issue was there with the OEM cam plate doesn't mean the piston in the billet plate is not sticking or seating properly.
I am also not sure which pressure gauge you are using. You have referred to a new sending unit and a manual pressure gauge; so which is it? Have you inspected the oil pump? There really aren't any secrets to oil pressure. everything that can affect oil pressure is pretty obvious.
I am repeating myself but just because you have a manual gauge doesn't mean it is accurate. Manual gauges can read wrong out of the box just like electronic gauges. If you haven't pulled the cam plate and checked the piston movement in the relief valve bore, you don't know if it is sticking or not. Just because the issue was there with the OEM cam plate doesn't mean the piston in the billet plate is not sticking or seating properly.
I am also not sure which pressure gauge you are using. You have referred to a new sending unit and a manual pressure gauge; so which is it? Have you inspected the oil pump? There really aren't any secrets to oil pressure. everything that can affect oil pressure is pretty obvious.
I haven't installed the new sending unit because the manual oil pressure check gauge is indicating the same symptoms as the original gauge in the dash, the original sending unit, the original cam plate, the original oil pump, the new billet cam plate, and the new HO oil pump. I realize these are manmade parts, but I would think the likelyhood of all those parts indicating the same symptoms from old parts to new parts would have astronomical odds. Maybe I'm wrong. So if I pull it all back apart what will the symptoms of a sticking relief valve look like? Sticking on the seat? sticking in the travel within the bore? I'm willing to entertain the idea. I've seen stranger things happen, but I figured the odds of the same thing with two cam plates being slim. Have you seen more than one in a row sticky? even two types (stock and SE)? Just curious how common it is within parts? Maybe it would make me feel better about tearing it all back down if it really is that often.
I am repeating myself but just because you have a manual gauge doesn't mean it is accurate. Manual gauges can read wrong out of the box just like electronic gauges. If you haven't pulled the cam plate and checked the piston movement in the relief valve bore, you don't know if it is sticking or not. Just because the issue was there with the OEM cam plate doesn't mean the piston in the billet plate is not sticking or seating properly.
I am also not sure which pressure gauge you are using. You have referred to a new sending unit and a manual pressure gauge; so which is it? Have you inspected the oil pump? There really aren't any secrets to oil pressure. everything that can affect oil pressure is pretty obvious.
If has a brand new SE HO oil pump in it installed with the cam plate.
Thank you sir. That's my next step. Sound exactly like the problem I have. All the way down to the previous motor being eaten by a bad cam bearing. lol.
Have you tested this problem with bike on dyno to remove any doubts of oil moving away from pick up and isolate rev range as it happens? and refer to djl have read if pan has been removed if gasket incorrectly fitted can cause suck air under acceleration.
Last edited by rick hull; Aug 16, 2019 at 12:14 AM.
Reason: spelt range wrong and wanted to refer to other post regarding all details of what was pulled off
Had any work been recently done on the bike prior to this all starting? If so what was it. The only time I have ever seen anything like this was from a misinstalled pan gasket.
As steve says it could be this. New cam plate could have a sticking relief valve also. Any swarf, left in the motor from the rebuild, could also cause it to stick.
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