8.1 inch rod in stock block/stroke 350 and -----

[Carnut1]

No.

The R/S ratio determines the maximum piston inertial loading and the optimum crankshaft angle

The greater the R/S, the less the maximum inertial piston loading and the more reliable the engine or the greater the red line.

The greater the R/S, the further past TDC the optimum crank angle occurs and the higher rpm at which the same maximum torque will occur with resultant higher horsepower

R/S greater than 1.9 starts to entail valve overlap breathing problems, possibly though.

This combo (if 3.48 crank) has a 2.33 R/S which would assume it is for a higher RPM engine?

With a welded con rod? I am thinking 6000 rpm max with that rod. I don't really see the advantages of such a long rod on a strength limited, rpm limited combo. Unless the piston-pin assembly is super light. I am hoping for a learning moment. Thanks, Charlie

[user-612937456]

Like I said, then maybe from here on out, I'll start a couple of threads with some cliffhangers,

Then again maybe you can showcase your superior intelect and start a thread about solving the P versus NP equation? Now there's a cliff hanger that could get some traction. .....................Crickets chirping.....................

Well....P versus NP isn't an equation. P = NP isn't either, since there is no problem to solve. Both are statements. P = NP? seems to be the correct expression, and the answer appears to be "no sometimes and yes other times."

It may be the most important question in computer science, but who cares if it takes more or less time to solve a problem or verify the solution...as long as I hit the letters and I can post on a web forum.......

Glad someone got it. It could make blykins a legend with the cliffhanger of all time in ST history.

[blykins]

I came up with a camshaft formula yesterday that works wonders. It only applies to Buick Nailheads with 125A alternators and Felpro oil pan gaskets, but after I get back from my stint in Finland for 6 weeks, I'll fill you in on it. Until I get back, feel free to talk about it for 25 pages so that the thread gets max coverage.

[randy331]

I find those believing there's some big advantage to tricks like odd ball rod lengths, tend to overlook the important things in favor of tricks of the month.

On a 350 SBC pick a commonly available rod, and study induction tracts, ex tracts, valve timing , valve trains, and leave the trick rods to others.

Randy

[rfoll]

I believe the purpose of the cliffhanger was to stir up thoughts on the mechanical dilemma. The persons who posted solutions make this thread interesting. I think if someone figured it out we wouldn't have several pages of complaining about the authors motives. I'm still waiting for the engineering solution. I'm here for the science and mechanics. It's hard to believe he's stumped us all.

[Warp Speed]

Its hard to believe it is being discussed! LOL

[ptuomov]

My personal opinion: This site is about entertainment and education. I think a thread with a welded-up super-long SBC rod and an interesting technical question kind of serves both functions, for me at least. I think this question about super-long rod and negative compression height forces many people out of their comfort zones, which then forces thinking things up from first principles. I can't see this either winning races (unless someone really screwed up the rule book!) or selling parts, so commercial motivations aren't probably underlying the thread. Finally, reading and responding are both completely voluntary activities -- this thread isn't for everyone, and needs not be for everyone.

[Stan Weiss]

I do not know what DV's thinking is on this. I know people say the rod just connects the piston to the crank. But for me this is a rather large change in cylinder volume change verse crank rotation.

Stan

ab-cvc-350.gif

[cjperformance]

I came up with a camshaft formula yesterday that works wonders. It only applies to Buick Nailheads with 125A alternators and Felpro oil pan gaskets, but after I get back from my stint in Finland for 6 weeks, I'll fill you in on it. Until I get back, feel free to talk about it for 25 pages so that the thread gets max coverage.

[In-Tech]

Its hard to believe it is being discussed! LOL

Stan has again shown how little rod ratio matters, that's about as extreme as it gets and a 4 degree change in event timing puts it all in check. I also love it when people talk about a 2 degree event timing change equates to anything. Most dyno's are not that accurate and most people don't repeat EXACT conditions so to confirm a +/- and even then a water brake isn't going to cut it, even electric dyno's wont repeat unless EXACT conditions are repeated.

In the elusive chase of 1 or 2 hp you will eventually find 20 but it is very painful to get there and the chase never ends.

[pdq67]

Well. what have we found out?

pdq67

[cjperformance]

Well. what have we found out?

pdq67

That the closest guess earns a free set of steak knives!

[lefty o]

i think he's using 2" thick head gaskets lol send me cash instead of ginsu knives please!!!

[GARY C]

Its hard to believe it is being discussed! LOL

Stan has again shown how little rod ratio matters, that's about as extreme as it gets and a 4 degree change in event timing puts it all in check. I also love it when people talk about a 2 degree event timing change equates to anything. Most dyno's are not that accurate and most people don't repeat EXACT conditions so to confirm a +/- and even then a water brake isn't going to cut it, even electric dyno's wont repeat unless EXACT conditions are repeated.

In the elusive chase of 1 or 2 hp you will eventually find 20 but it is very painful to get there and the chase never ends.

How do you chase 1 or 2 horse power if you can't measure it?
If you chase it and rod length is 1 of those 2 horse power would it be worth discussing?
Just seems like a self defeating statement.

[GARY C]

Well. what have we found out?

pdq67

That some people have it all figured out and if you do something different those people will do their best to discredit you...You see it in the news every day.
On the flip side there are those who don't stop their pursuit of learning and invent things like light bulbs, manned flight and more efficient combustion chambers.
I wonder where we would be if Smokey, Grumpy and Big Daddy had listened to the scoffers of their day?