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FE Power Forums => FE Technical Forum => Topic started by: turbohunter on May 10, 2015, 04:53:38 PM

Title: Dyno results curiosities
Post by: turbohunter on May 10, 2015, 04:53:38 PM

Thanks for starting the Dyno and 1/4 mile results child boards Jay.
The posts are very interesting.
One question I have is, I don't see any combos with 6.8 rods ( save one on the TP by Brent )
Matter of fact I don't recall seeing one at all in the last few years (except mine for my truck  :) and the one by Brent).
Is there a reason for that?

Title: Re: Dyno results curiosities
Post by: jayb on May 10, 2015, 05:47:51 PM

Marc, actually the 511" FE I used in Drag Week, and shown in the dyno results section, used 6.8" rods.  The only downside I can see is that sometimes with a 6.8" rod the pin will protrude into the oil ring groove, necessitating the use of lower rails in the ring groove, to support the ring.  With a 6.7" rod and 4.25" stroke, you don't have that issue, so I think that is why it is the standard combination.

Title: Re: Dyno results curiosities
Post by: Joe-JDC on May 10, 2015, 06:17:27 PM

When I ordered a stroker from Scat, I ordered the 4.125" crank, 6.800" rod, and they sent the same piston as used for the 4.250"/6.700" combo.  I personally have had great success with using the longest rod possible in all my stroker combinations.   Joe-JDC

Title: Re: Dyno results curiosities
Post by: blykins on May 10, 2015, 06:31:02 PM

I had a couple of 6.800" rod engines in the dyno section.....the Tunnel Port and the 427 LR. 

Title: Re: Dyno results curiosities
Post by: turbohunter on May 10, 2015, 06:44:38 PM

Saw the TP engine Brent and missed the LR.
Is it so bad to have to use support rails?
And Joe, I always figured the mechanical advantage of a longer arm is good too.

Title: Re: Dyno results curiosities
Post by: blykins on May 10, 2015, 07:02:56 PM

No, it's not bad to use support rails....no problem whatsoever.