Hi,
I am looking for some guidance and shared experience regarding the axial clearance on Carrillo rods.
I have a new set of PR-R912-1HS-5352B4S Cam Clearance Rods, on doing a dry set up to check clearances, set TDC etc. I found that the axial clearance between the rod and crankshaft was 0.457mm = 18thou. which is +6 thou (0.157mm) outside of the axial clearance spec of 0.10mm - 0.30mm.
After measuring everything to double check, the Carrillo rod width which incidentally matches the Carrillo specification drawing is 19.53mm, measuring 4 original Porsche rods for comparison R616.013.101.01 rods, they measured 19.78mm.
My questions are; is there a reason for the smaller rod width? and has anybody had experience in running with this amount of axial play?
Many thanks
Nigel
Carrillo Connecting Rod Axial Clearance
- Nigel Cousins
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Re: Carrillo Connecting Rod Axial Clearance
Hi Nigel What a good question!
And are the bearings supplied with the Carillo Rods also short on the width? Any less Rod Bearing Footprint isn't good. I don't unfortunately have the answers for You but look forward to our experts Input
Kind Regards Jay
And are the bearings supplied with the Carillo Rods also short on the width? Any less Rod Bearing Footprint isn't good. I don't unfortunately have the answers for You but look forward to our experts Input
Kind Regards Jay
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Re: Carrillo Connecting Rod Axial Clearance
That clearance is not a problem. Sometimes the extra clearance is used to improve oil flow through the rod bearing.
Are you using a stock crank or Scat etc crank? Make sure you have adequate axial clearance between the bearing and the crank. Trim the bearing if needed.
Are you using a stock crank or Scat etc crank? Make sure you have adequate axial clearance between the bearing and the crank. Trim the bearing if needed.
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Re: Carrillo Connecting Rod Axial Clearance
That must not be a critical dimension, Vic has said he clearances them with a belt sander when needed.
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Re: Carrillo Connecting Rod Axial Clearance
Thank you Jay, Martin and C.J. for responding so quickly.
For your information the rod bearings measure at 15.86mm wide which is narrower than the rod axial surface. Are wider shells available? I checked another standard set from another manufacturer and they were 15.90mm wide.
The Crank is an IKE knife edge counter weight design. IKE are a UK race parts supplier and machine shop.
The IKE crank rod Journals measure at 52.750mm diameter and 20.01mm wide. I had the journal reground as I was not happy with the tolerances out of the box.
As a double check to ensure the crank had not be made wrong. I measured 3 original Porsche cranks I have, to compare journal width and they ranged from 19.97mm - 20.01mm, so not a problem.
Thank you again for any thoughts, I feel it is better to seek advice and question, especially when something comes up out of spec.
Kind regards
Nigel
For your information the rod bearings measure at 15.86mm wide which is narrower than the rod axial surface. Are wider shells available? I checked another standard set from another manufacturer and they were 15.90mm wide.
The Crank is an IKE knife edge counter weight design. IKE are a UK race parts supplier and machine shop.
The IKE crank rod Journals measure at 52.750mm diameter and 20.01mm wide. I had the journal reground as I was not happy with the tolerances out of the box.
As a double check to ensure the crank had not be made wrong. I measured 3 original Porsche cranks I have, to compare journal width and they ranged from 19.97mm - 20.01mm, so not a problem.
Thank you again for any thoughts, I feel it is better to seek advice and question, especially when something comes up out of spec.
Kind regards
Nigel