threw another #3 rod, how to prevent this from happening again. |
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threw another #3 rod, how to prevent this from happening again. |
crash914 |
Oct 29 2019, 03:17 PM
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#1
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
So blew up my #3 rod. wondering what caused this. lack of oil, due to rpm? poor return? oil pump sucking air?
last time it was #2 rod. I really don't want to live with this again. Motor specs, Dual oil coolers with full flow plumbing 102 bore by 80mm stroke long rods, ham heads and valve train. Running to 6800 rpm g loads to 1.5 windage tray modified at pushrod tubes for oil flow tuna can with 1/2 extra oil Pics of horror below. First are this failure, then old failure. |
GregAmy |
Oct 31 2019, 04:10 PM
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#2
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
Totally taking this off-topic a bit further...last few races I experienced unhappiness with my 914 regarding vented rockers.
Last summer with my 2L I was taking a nice long left-hander at Thompson (under the bridge) and the pressed vent tube in the right head came out. Dumped shad-ton of oil all around the bend, causing a couple cars to spin and one to hit the wall (I strongly apologized and ensured he did not buy beer or dinner that night). Field-fixed it by slightly swaging the tube, tapping it back in tightly, and gooping it with silicon. Held for the weekend. This September at the Lime Rock Labor Day historics, using a borrowed 1.8L. The valve covers have welded 1/2" tubes coming off the valve covers with oil hose secured by hose clamps. First session out, driving through Big Bend and the left hose came off the tube....dumping a shad-ton of oil all around the bend, causing myself and several other cars to spin (no contact, thank goodness). Field-fixed by cleaning it all up, screwing it on as tight as I could, then drilling a hole across the hose, clamp, and tube and putting in a cotter pin, sealing it with silicon. Held for the rest of the weekend. I'm also running a CB Performance dry sump pump. I'm really getting tired of that. If I don't need these rocker vents then I'll just drill/tap/plug the holes on the 2L engine I'm building now and be done with it. Attached thumbnail(s) |
HAM Inc |
Oct 31 2019, 05:20 PM
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#3
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
Totally taking this off-topic a bit further...last few races I experienced unhappiness with my 914 regarding vented rockers. Last summer with my 2L I was taking a nice long left-hander at Thompson (under the bridge) and the pressed vent tube in the right head came out. Dumped shad-ton of oil all around the bend, causing a couple cars to spin and one to hit the wall (I strongly apologized and ensured he did not buy beer or dinner that night). Field-fixed it by slightly swaging the tube, tapping it back in tightly, and gooping it with silicon. Held for the weekend. This September at the Lime Rock Labor Day historics, using a borrowed 1.8L. The valve covers have welded 1/2" tubes coming off the valve covers with oil hose secured by hose clamps. First session out, driving through Big Bend and the left hose came off the tube....dumping a shad-ton of oil all around the bend, causing myself and several other cars to spin (no contact, thank goodness). Field-fixed by cleaning it all up, screwing it on as tight as I could, then drilling a hole across the hose, clamp, and tube and putting in a cotter pin, sealing it with silicon. Held for the rest of the weekend. I'm also running a CB Performance dry sump pump. I'm really getting tired of that. If I don't need these rocker vents then I'll just drill/tap/plug the holes on the 2L engine I'm building now and be done with it. Greg you don't need anymore oil incidents! Your last one ought to hold you for the rest of your driving career. (IMG:style_emoticons/default/happy11.gif) |
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