Offshoreonly.com - Rod bolts, main caps, and what not.

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LOl.
Current dog is Axle. When he poops and someone I know is around I'll say something like "Damn it. My axle took a schit again." Crosseyes. LOL.

Quote:

Originally Posted by SB (Post 4227195)

The most murderous action placed on rod bolts is when the rod stops and then starts and continues to accelerate back down from TDC on the exhaust /intake stroke. IE:overlap.

No compressive forces helping to keep the piston + such pushed towards the rod cap.

So, its not really horsepower, it's rpm's vs piston/ring/pin/ good part of the connecting rod itself weights that's trying to seperate from the connecting rod's cap.

All my IMHO of course.

I know an old time drag racer that used to insist that at the end of the quarter mile kill fuel and ignition but leave the throttle wide open to minimize the stress put on the cap and bottom of the piston when forces switch direction.

Also, every circle track engine I have seen come apart is when lifting off the throttle coming into a corner.

Inlaws had an outdoor cat named lightening, imagine when she called it in every night, neighbors think she is a nut

Quote:

Originally Posted by abmotorman (Post 4227296)

And was your point to derail this? Thanks for the recap and your Marine engine wisdom genius! FYI, we're talking lower ends, NOT cams.

*FYI, an outlaw car that is locked in gear, entering and exiting corner, lifting (dragging the lower end) and hammering the throttle, at much higher RPM is very abusive to the lower end. Tolerances are critical since the bearing sees loads on all sides. Marine engines, sees this only when the prop is moving air. BOTH are abusive environments and alot can be learned by both. Let's keep an open mind.

Please let's. My Briggs and Stratton runs 3600-4000rpm all day. With an aluminum rod. It gets real wild when I cut the blade and push the clutch in at the same time. It does that on relatively cheap hardware. Big difference is no reversion.

So now that we got lawn mower racing out of the way let's talk lower ends. Only offshore boats need stout lower ends.
http://thechive.files.wordpress.com/...pg?w=500&h=662

Quote:

Originally Posted by mike tkach (Post 4227423)

ouch,there goes the first wheel,next comes complete derailment.

I think Motor had a very valid point.

Quote:

Originally Posted by Black Baja (Post 4227424)

I think Motor had a very valid point.

yes he did,and i agree,now back to total derailment please.

No problem. Since we are talking long lasting engines that run sustained speeds and get crazy shock loads.

Here's the link to the specs on my lawn mower engine. Mine is model 4029.
http://www.briggsandstratton.com/us/...0BuiltVert.pdf

It does all that without pressurized lube, inconel exhaust valves, or water cooling.

Quote:

Originally Posted by donzi matt (Post 4227375)

So is it safe to say when your rockin it in rough water doing some throttling your rod bolts are seeing a lot of abuse ?

Quote:

Originally Posted by MILD THUNDER (Post 4227434)

So is it safe to say when your rockin it in rough water doing some throttling your rod bolts are seeing a lot of abuse ?

I thought that was a given.

so what is the main job of the rod bolts?