 914-4 2L #3 rod bearing failure |
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| Driver174 |
 Aug 8 2018, 11:50 PM
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#1
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Member  Group: Members Posts: 122 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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Replies
| ClayPerrine |
Aug 9 2018, 06:43 AM
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#2
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Life's been good to me so far..... Group: Admin Posts: 16,545 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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I have seen it in a street engine. That is the rod bearing that is farthest from the oil feed to the crank. So it is the first to suffer with oil starvation. It could be anything from an incorrectly installed main bearing restricting the oil flow to the crank, or some debris in the oil feed passage.
Hard to tell what caused it, but I would replace the crank and rods as a precaution. |
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| stownsen914 |
Aug 9 2018, 06:59 AM
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#3
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Senior Member Group: Members Posts: 1,016 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Looks like an aftermarket rod in the pic at top? What rods are you using? Bearings? Any special prep on crank? Any details you can share on usage may help too - hp, RPM, any other significant details. Lots of variables for a race motor that can impact longevity, like oil temp, anything to help with oil starvation in corners (especially of you are running sticky tires).
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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 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 yeahmag Had this happen to my rod bearings twice even whil... Aug 14 2018, 10:40 AM 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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