 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: 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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| ChrisFoley |
Aug 9 2018, 07:03 AM
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#2
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I am Tangerine Racing Group: Members Posts: 7,986 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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Do you have any deep sump or tuna can? Do you maintain the oil level 1/2qt above the full line?
You were lucky. If the bearing material started sticking to the crank it would have seized quickly. |
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| worn |
Aug 13 2018, 04:28 PM
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#3
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Winner of the Utah Twisted Joint Award Group: Members Posts: 3,470 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(Racer Chris @ Aug 9 2018, 06:03 AM)  Do you have any deep sump or tuna can? Do you maintain the oil level 1/2qt above the full line? You were lucky. If the bearing material started sticking to the crank it would have seized quickly. In such a situation, what happens to the main bearings at that end? For the bearings to be so galled it almost has to be poor oiling doesn’t it? |
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| ChrisFoley |
Aug 13 2018, 06:35 PM
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#4
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I am Tangerine Racing Group: Members Posts: 7,986 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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QUOTE(worn @ Aug 13 2018, 06:28 PM) ... In such a situation, what happens to the main bearings at that end? For the bearings to be so galled it almost has to be poor oiling doesn’t it? The mains can actually take a bit more abuse than a rod bearing considering the multiple supports to the crank, and excess oil from the mains is what feeds the rod bearings. |
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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 Mark Henry
Do you have any deep sump or tuna can? Do you mai... Aug 9 2018, 08:09 AM 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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