nm9stheham
Well-Known Member
FWIW..... IIRC the SCAT rods we got had no 'side' offset.... but the big end widths are .010" or so narrower than stock rods, which helps make up for some of that 'no offset'.
What is being said is.. 'pertaining to the rods in question'... the thrust side sticks out more, it is offset to one side of the beam.
Say it however you wanna say it... he has no hair, no...he is bald, uh maybe he is hairless, if only I was as tall as I am long, or wide as I am fat...
I can't say I am sure on this idea.... so you are using the pistons & pin bosses to control the location and side float on the rods? Doesn't that put abnormal forces on the sides of the pistons? Never heard of such a thing... but I sure haven't heard of everything....Since the original application was a Chevy RO7, and my SBM 383 journals are wider than the width of the big ends when installed, I'll make some washers to fit on to the piston pins so the rod will be centered on the piston...
I can't say I am sure on this idea.... so you are using the pistons & pin bosses to control the location and side float on the rods? Doesn't that put abnormal forces on the sides of the pistons? Never heard of such a thing... but I sure haven't heard of everything....
Cool, doesn't mean **** pertaining to the rods in question and ill probably put you on ignore now...but what the hell.I've never thought of it as the "thrust side". If it's made as those 340 rods shown are you'd match them side to side as long as the oil squirt holes line up to lube the cam and cylinders. There's really no thrust side except on the mains...
But if the rods are all machined evenly side to side you'd simply install them as usual and measure your side clearances and you're done.
Those Pankl rods are the same side to side but they are machined so one side goes towards the crankshaft radius.
Racetec will be making the pistons to hang on these rods... Since the original application was a Chevy RO7, and my SBM 383 journals are wider than the width of the big ends when installed, I'll make some washers to fit on to the piston pins so the rod will be centered on the piston... Pretty common deal when mixing and matching used and new parts from who knows how many original applications... View attachment 1715123735
View attachment 1715123736
-Those Pankl rods...
Isn't a Pankl rod a titanium deal? They sure look like that...
These were non-floating...Yes, those rods don't have an offset because they are pin guided rods. You have to compare apples to apples. A non pin guided rod has offset.
Thanks very much. This particular idea is all new to me. Is there anything different in the piston design if it is used to guide the rod (via the pin)? I'm just trying to figure out where the forces go and how that effects things....if the rod drifts forward or backwards, something has to restrain it. (Which I assume is the reason for the washers Kooser is referring to...)Yes, those rods don't have an offset because they are pin guided rods. You have to compare apples to apples. A non pin guided rod has offset.
There is no HP "gain" to reversing piston offset, but the actual effects are very noticeable.As I said...all V-8 rods I can think of off the top of my head are offset. They have to be.
Yes you can flip the piston on the rod if the pin is offset but IMO it's a waste of time. The HP you MAY gain is minimal.
As for con rod offset, u need to have that to keep the rod centered on the pin in the piston as 1 cylinder is ahead of the opposing cylinder. Kim[/QUOTE
early 273 rods are not off set. only ones I ever sawAs I said...all V-8 rods I can think of off the top of my head are offset. They have to be.
Yes you can flip the piston on the rod if the pin is offset but IMO it's a waste of time. The HP you MAY gain is minimal.
you guys are using the word offset for two different things and really mixing things up badly . The pin bore in the piston ( or less likely the small end?) is offset to avoid piston slap or rocking SIDE to SIDE looking frum front of engine . Done . Maybe very slight power gain / reducing friction but you will have violent slap , break piston . bad trade . when the plug fires . That is one thing —Krooser, y did u delete ur statement? If the pin is centered in the rod on a pressed pin the pin will not be centered in the piston because of the cylinder offset. Kim