Rev limit setting on cast 95" pistons

[mayor]

I just switched my SE6200 module out for a SE adjustable in my 95" cast piston TW54 build.  The catalog is saying 6,200 is max for rpm's for cast pistons.  My new module has a 6,000 and a 6,500 setting.  I'm banging the heck out of the 6K, whose all running rev limiters with cast pistons at 6,500 and up?  I figured what's the big deal with the extra 300 rpm, right?   

[Killer]

I don’t need any stinking rev-limiter, it slows me down…

[Billy]

Let the Big Dog eat.

[V24me]

I run a Crane ignition with 100 rpm increments and cast pistons and I would NOT adjust to over 6200.  I hit the limiter once in a while, but usually I am on the back side of the hp/torque curve. 

[Gulfstream]

If it were me I'd stay with the 6200 RPM limiter. The TW54 cam ain't building power at this point and it gets expensive if that "big dog" pukes.

[Faast Ed]

The catalog is saying 6,200 is max for rpm's for cast pistons.

Ain't just your pistons affected by overly high rpm's. 

[maineultraclassic]

6200 is all I go.

Steve

[mayor]

The catalog is saying 6,200 is max for rpm's for cast pistons.

Ain't just your pistons affected by overly high rpm's. 

that's what I'm thinking.  I think the argument that Harley uses is the stress created by the increased rpm's over 6,200.  The module I'm using goes from 6k to 6.5k, but the bike still feels like it's pulling at 6k.  The problem I have is it shuts off completely at 6, so I end up short shifting if I'm carrying on. It's kinda embarrassing when your racing someone and the bike hits the limit.    I'm not too concerned about setting the limit at 6.5, but I can see it being accidentaly taken to the limit occasionally.  I'm surprised that no one has stepped up to say they were a pioneer, and blazed into uncharted territory.   

[Don D]

A or B motor?

[GoFast.....]

I just switched my SE6200 module out for a SE adjustable in my 95" cast piston TW54 build.  The catalog is saying 6,200 is max for rpm's for cast pistons.  My new module has a 6,000 and a 6,500 setting.  I'm banging the heck out of the 6K, whose all running rev limiters with cast pistons at 6,500 and up?  I figured what's the big deal with the extra 300 rpm, right?   

If the power is all done at 6200 why go on. SHIFT

[Don D]

Good point!
But really there can be other reasons why not to go higher as ED said. Balancers if you have them for 1. Really when speaking about pistons the crank rotating speed is not as critical as what is happening in the chamber. The cast piston is still a strong piece but if run at higher RPMS just needs to be clearanced slightly higher (in the range of manufacturers recommended tolerances), run with the proper mixture, not overheated and not detonated and all will be fine. The forged piston will just take more of the wrong operation before letting go. The  forged alloy is actually softer than the cast or Hyper alloys. Remember GM "High Impact" gear sets for drag racing? Softer not harder, same concept.

[hotbo]

i have hit 6500  more than i can count.i have screaming eagle hyp.cast flat tops.have well over 40,000 miles since the build as of date no problems.

this does not mean it is good on them,i just always play very hard and sometimes i miss a shift or stay in it to long and bang out,lol!!!!

[PanHeadRed]

>I just switched my SE6200 module out for a SE adjustable<

Sup?

[mayor]

A or B motor?

"A" (Dyna), so no balancers to worry about. 

If the power is all done at 6200 why go on. SHIFT

The bike revs fast, and I like to make sure I get it all in.     Besides, I could live with 6.2k, but that's not a choice I have.  I have 6k or 6.5K

RPH, I wanted more adjustability but didn't want to take the bike halfway apart everytime I wanted to play.  The Dyna chassis sucks when it comes to location of ignition module.   

[HIPPO]

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