 914-4 2L #3 rod bearing failure |
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| Driver174 |
 Aug 8 2018, 11:50 PM
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Member  Group: Members Posts: 120 Joined: 2-February 17 From: Nevada Member No.: 20,806 Region Association: None 
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Rod bearings 1,2 & 4 look good, but #3 not so good. This engine has approximately ten race weekends sense it was rebuilt. Has anyone seen this issue?
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| yeahmag |
Aug 14 2018, 10:40 AM
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Advanced Member Group: Members Posts: 2,448 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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Had this happen to my rod bearings twice even while running Brad Penn, a tuna can, and 1/2 quart over. What I found was happening (based on logging oil pressure) was the oil was not draining back fast enough. If you don't want to go dry sump (which I did) you can try blocking off the head vents and enlarging the case vent. The idea is to keep the heads at a higher pressure than the case to increase oil flow (return) back to the case. I run a -10AN line from the chimney to a cheap breather.
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Posts in this topic
Driver174 914-4 2L #3 rod bearing failure Aug 8 2018, 11:50 PM
Driver174 Pic of crank journal that doesn't look or feel... Aug 8 2018, 11:55 PM Krieger I have not taken apart a motor with that little ti... Aug 8 2018, 11:55 PM flyer86d We had the same issue with our modified 1.7. With ... Aug 9 2018, 04:52 AM 914Sixer Are you using steel backed bearings? Aftermarket ... Aug 9 2018, 05:43 AM ClayPerrine I have seen it in a street engine. That is the rod... Aug 9 2018, 06:43 AM
stownsen914 Looks like an aftermarket rod in the pic at top? W... Aug 9 2018, 06:59 AM Racer Chris Do you have any deep sump or tuna can? Do you main... Aug 9 2018, 07:03 AM Mark Henry
Do you have any deep sump or tuna can? Do you mai... Aug 9 2018, 08:09 AM worn
Do you have any deep sump or tuna can? Do you mai... Aug 13 2018, 04:28 PM Racer Chris
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In such a situation, what happens to the main... Aug 13 2018, 06:35 PM GregAmy :shudder:
That's why I spent the coin for a d... Aug 9 2018, 07:07 AM stownsen914 Listen to what Racer Chris has to say - tons of ex... Aug 9 2018, 07:31 AM McMark I'm late to the party, but I agree with Mark a... Aug 9 2018, 09:51 AM Driver174 It has the "tuna can" oil sump and an oi... Aug 9 2018, 10:24 AM brant Is there any way to improve on your oil cooler sys... Aug 9 2018, 10:31 AM Driver174 I do believe adding more air exit area from the oi... Aug 9 2018, 11:16 AM brant
I do believe adding more air exit area from the o... Aug 9 2018, 11:26 AM Vacca Rabite
I do believe adding more air exit area from the o... Aug 9 2018, 11:28 AM brant I would add that you need air flow under the car t... Aug 9 2018, 11:44 AM stownsen914 250 is a bit hot. You can easily drop the temp by ... Aug 13 2018, 04:09 PM Tbrown4x4 Lots more surface area on the mains too.
Was ther... Aug 13 2018, 09:57 PM 914werke Aftermarket rods do not have an oil slinger slot ... Aug 13 2018, 10:05 PM Racer Chris I think getting rid of the windage tray and keepin... Aug 14 2018, 10:53 AM Driver174
Lots more surface area on the mains too.
Was the... Aug 14 2018, 09:57 PM Driver174
Had this happen to my rod bearings twice even whi... Aug 14 2018, 10:09 PM Racer Chris
I'm using Brad Penn as well in 20W50 viscosi... Aug 15 2018, 05:26 AM brant You also need to run a synthetic
Dino oil is goin... Aug 15 2018, 06:51 AM Driver174 Did a trial assembly tonight with new main bearing... Aug 18 2018, 01:53 AM |
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