GermanLook Forums  

Go Back   GermanLook Forums > Technical Section > Engines

Reply
 
Thread Tools Display Modes
  #1  
Old April 3rd 2011, 16:56
Bugscandrift Bugscandrift is offline
Registered User
 
Join Date: Sep 2004
Location: Pensacola, FL
Posts: 89
New Engine Knock

Hey there,

I just got my 1915 turbo build up and running and have put about 50 miles on the engine. I'm running a deep sump, full flow oil filter, external oil cooler, the rockers are adjusted within spec. Within the past four or five miles or so, its started having what almost sounds like a rod knock and its blowing white smoke out the exhaust. My first guess about the white smoke was that it was that the turbo seals were leaking, so I took the wastegate off and it was blowing white smoke from the wastegate hole, which tells me that the oil is burning before the turbo. Ive been driving it easy to break it in and have only got on it maybe twice. I've checked the tolerances for the rockers like six times hoping that could be it.

Does it sound like maybe my bearings AND rings didn't seat correctly and Im going to have to pull the motor down and rebuild it or what? I'm kinda stumped at this point..
__________________
If god had meant people to walk, whyd he invent cars?
Reply With Quote
  #2  
Old April 3rd 2011, 20:03
effvee effvee is offline
Registered User
 
Join Date: Aug 2002
Location: California
Posts: 701
Oil Cooler?

Hi, you mention oil cooller, How far away and how large ID are your oil lines. Maybe after your road test, very soon after you get it home recheck for valve clearences. What are your oil pressures/cold and while driving? When you get on it, does the oil pressure go up as well? Lastly how the timing. Just something to check.
Reply With Quote
  #3  
Old April 3rd 2011, 21:43
Bugscandrift Bugscandrift is offline
Registered User
 
Join Date: Sep 2004
Location: Pensacola, FL
Posts: 89
The oil cooler is under the passenger rear fender, not far at all from the engine and the lines are -8. The oil pressure was higher than I thought it should be, but I just figured it was because of the turbo, and it went up when I got on it. I don't remember exactly what they were though. I'll have to check out the timing next time I'm able to get out to the garage to work on it.

And for right now, until I figure out what it is I'm kinda hesitant to drive it. If I am going to have to do a rebuild, I want to try and keep the damage as limited as possible. I haven't driven it since I checked the clearances last time and it was making the knock as soon as I started it up..
__________________
If god had meant people to walk, whyd he invent cars?
Reply With Quote
  #4  
Old April 4th 2011, 15:13
effvee effvee is offline
Registered User
 
Join Date: Aug 2002
Location: California
Posts: 701
turbo?

Hi, concernig your turbo. What oil resistrictor size are you running? The engine knock is that bad, what rods are you running, and is the rod bolt and nuts stock? If the noise is that bad, hay just take the engine apart for safety sake.
Reply With Quote
  #5  
Old April 4th 2011, 16:06
Bugscandrift Bugscandrift is offline
Registered User
 
Join Date: Sep 2004
Location: Pensacola, FL
Posts: 89
I think its a .065 hole restrictor in -3 inlet line.. Sorry for the uncertainty, I started building this motor over three years, three different houses, and a trip to the desert ago so I don't remember some of the particulars.

I mean, the knock isnt THAT bad.. It just makes me nervous because knocks are never good and I have WAY too much time and money in this motor to blow it up..

I might just pull it down anyways. I have to pull the motor out to paint the engine bay anyways.
__________________
If god had meant people to walk, whyd he invent cars?
Reply With Quote
  #6  
Old April 4th 2011, 17:34
effvee effvee is offline
Registered User
 
Join Date: Aug 2002
Location: California
Posts: 701
.065

Hi, well with a .065 oil restrictor, it rules out loss of oil pressue do the turbo. error on the safe side and take her apart, Good luck
Reply With Quote
  #7  
Old April 4th 2011, 21:38
petevw's Avatar
petevw petevw is offline
Moderator
 
Join Date: Jul 2002
Location: toronto, ontario, canada
Posts: 1,348
Do you think its pinging?
__________________
'72 super
'65 bus
'52 split
Reply With Quote
  #8  
Old April 4th 2011, 21:40
Bugscandrift Bugscandrift is offline
Registered User
 
Join Date: Sep 2004
Location: Pensacola, FL
Posts: 89
It's not pinging it's actually running somewhere on the rich side. It's definitely some kind of a knock. I'm just not sure what type of knock it may be.
__________________
If god had meant people to walk, whyd he invent cars?
Reply With Quote
  #9  
Old April 13th 2011, 02:24
vugbug71's Avatar
vugbug71 vugbug71 is offline
Registered User
 
Join Date: Dec 2009
Location: sactown/placerville, CA
Posts: 22
if your valves are adjusted correctly, then its probably a rod knock. what about when you push on the clutch does anything change? I was driving with a jacked up pushrod for a while and my engine sounded great lol, went to adjust the valves and yikes!! so i would doubt its valve adjustment. what about exhaust leak? sometimes they sound like a knock
Reply With Quote
  #10  
Old April 15th 2011, 16:18
spannermanager spannermanager is offline
Registered User
 
Join Date: Nov 2005
Location: London and kent.
Posts: 185
What deck are you running? I had a mystery knock and smoke to sort out and it was a piston hitting, just the merest touch as it ****ed at tdc did it.
Reply With Quote
  #11  
Old April 16th 2011, 07:40
Bugscandrift Bugscandrift is offline
Registered User
 
Join Date: Sep 2004
Location: Pensacola, FL
Posts: 89
It doesnt seem like the piston is touching.. Ive turned it over by hand a million times and I would think that it would make it somewhat difficult to turn if it were.. I havent been able to work on it in like two weeks but Im tearing into it today and Ill let yall know what I find..
__________________
If god had meant people to walk, whyd he invent cars?
Reply With Quote
  #12  
Old April 16th 2011, 15:45
Bugscandrift Bugscandrift is offline
Registered User
 
Join Date: Sep 2004
Location: Pensacola, FL
Posts: 89
So, I got rid of the knock (permenantly I hope). I ripped it apart and was checking out the pushrods and one of them was slightly bent. I didnt think that could cause a knock like that, but I put in a new set of pushrods and its quiet as a mouse.. Its running great now, but its storming so I cant test drive it. But I had it running in the garage for a while.. I need to do a crankcase vent or something because it has like 75PSI of oil pressure at idle and like 110PSI when I hit the throttle..
__________________
If god had meant people to walk, whyd he invent cars?
Reply With Quote
  #13  
Old April 18th 2011, 22:36
vugbug71's Avatar
vugbug71 vugbug71 is offline
Registered User
 
Join Date: Dec 2009
Location: sactown/placerville, CA
Posts: 22
Quote:
Originally Posted by Bugscandrift View Post
So, I got rid of the knock (permenantly I hope). I ripped it apart and was checking out the pushrods and one of them was slightly bent. I didnt think that could cause a knock like that, but I put in a new set of pushrods and its quiet as a mouse.. Its running great now, but its storming so I cant test drive it. But I had it running in the garage for a while.. I need to do a crankcase vent or something because it has like 75PSI of oil pressure at idle and like 110PSI when I hit the throttle..
congrats on fixing the knock!! but your high oil pressure isn't due to crankcase ventilation, what weight oil and what size oil pump are you running? also check your relief springs and pistons. your psi shouldn't be anymore than 50psi at idle when cold or 20psi idle hot, IMO
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 16:14.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
© www.GermanLook.net 2002-2017. All Rights Reserved