[Fot] 89MM piston question

tr4racing at googlemail.com tr4racing at googlemail.com
Mon Sep 3 00:34:36 MDT 2018 

My engine has sloppy 154 lbs ft at 3500 and a peak 165 lbs ft at 5500.

Peak power at 6100 – 178 hp.

Bore 88mm, stroke standard.

Cast iron head, with standard diameter valves.

 

Cheers

Chris

 

Von: Fot <fot-bounces at autox.team.net> Im Auftrag von Bill via Fot
Gesendet: Montag, 3. September 2018 06:01
An: Mordy Dunst <gasket.works at gte.net>
Cc: fot at autox.team.net
Betreff: Re: [Fot] 89MM piston question

 

I do have an engine that produces 186HP per liter—the one in my 750 MV Agusta Senna. 140 horsepower at 12600 RPM. I promise you that every one of those ponies counts. 60 lb-ft of torque at 10500 RPM. Scares the crap out of me. I’d buy that a TR motor could produce 200+ HP if it revved to 10K. Failing that, not so much. Certainly not with a two valve, non-crossflow head with cross sections that looks like the casting was molded with plumbing parts.  200HP at 6000 rpm is 175 ft-lbs of torque. I think the most recent engine build for Peyote by Tony Garmey at Horizon Racing was about 140 ft-lbs peak, and it’s 89mm with all the goodies. 





On Sep 2, 2018, at 8:46 PM, Bill <bill at ponostyle.com <mailto:bill at ponostyle.com> > wrote:

 

It always puzzles me when people say that. Horsepower is torque times RPM (and a conversion factor). Torque is horsepower/RPM. So how can one count more than the other? 





On Sep 2, 2018, at 4:13 PM, Mordy Dunst via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote:

 

Its the torque that counts.  So, I suspect the motor enhancements took the benefit of the tractor stroke.  If the motor is  able  to produce  that power at 6k rpm with shift at 6500.    

I shift at @ 6200 - my motor produces  max power @5800 on the dyno. I use a kastner designed cam for which  I have the masters. 

 

 

 

MDunst Headgasket.com <http://headgasket.com/>  626.358.1616 <tel:626.358.1616>  

Fax 626.628.3777 <tel:626.628.3777>  

Triple R Munitions, Inc 626.201.9471 <tel:626.201.9471>  

T FFL 6,7 SOT 2

 

On Sunday, September 2, 2018, John Styduhar via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote: 

 

What kind of modifications were done to the engine to extract over 200 HP from a tractor engine?  Nitrous shot.

 

 

On Sat, Sep 1, 2018 at 3:05 PM Thomas Boyd <tom at trenterprises.com <mailto:tom at trenterprises.com> > wrote:

All of our FIA race cars are running legal 87mm engines.

Just rolling roaded the latest SLR build at well north of 200bhp

Thomas Boyd

Director

TR Enterprises

01623 793807 (ext 302) <tel:01623%20793807;302> 

www.trenterprises.com <http://www.trenterprises.com/> 

 


On 1 Sep 2018, at 17:02, John Styduhar via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote:

If you really had serious compliance with most group's rules, I would guess half the TR cars would not pass muster.  Let's have fun together.   

 

 

On Sat, Sep 1, 2018 at 9:40 AM Terry Stetler via Fot <fot at autox.team.net <mailto:fot at autox.team.net> > wrote:

Indeed there are Glen.

 

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>  for Windows 10

 

  _____  

From: Fot <fot-bounces at autox.team.net <mailto:fot-bounces at autox.team.net> > on behalf of fubog1 via Fot <fot at autox.team.net <mailto:fot at autox.team.net> >
Sent: Saturday, September 1, 2018 7:34:26 AM
To: rkramer56 at gmail.com <mailto:rkramer56 at gmail.com> 
Cc: fot at autox.team.net <mailto:fot at autox.team.net> 
Subject: Re: [Fot] 89MM piston question 

 

everybody else seems to be using 89.

HaHa not everybody, rules say 87mm, there are still a few guys running them (and winning)...

Glen 

 

 

 

-----Original Message-----
From: Bob Kramer via Fot <fot at autox.team.net <mailto:fot at autox.team.net> >
To: van.mulders.marcel <van.mulders.marcel at telenet.be <mailto:van.mulders.marcel at telenet.be> >
Cc: fot <fot at autox.team.net <mailto:fot at autox.team.net> >
Sent: Fri, Aug 31, 2018 11:26 pm
Subject: Re: [Fot] 89MM piston question

I've always used 87 MM due to the rules but everybody else seems to be using 89. The procedures are the same so It'll be the same. I blew a head gasket last time out, compression into the cooling system and blew off the bottom hose. I guess it wasn't tight enough, and scuffed two pistons before I could shut it down. 




Bob Kramer

 

On Fri, Aug 31, 2018 at 12:43 PM, <van.mulders.marcel at telenet.be <mailto:van.mulders.marcel at telenet.be> > wrote:

Bob,

It is definitely necessary to make that modification to the liners. The relieve should correspond to the shape of the combustion chambers : about 4 mm wide on a 89mm engine.

Marcel

 


  _____  


Van: "fot" <fot at autox.team.net <mailto:fot at autox.team.net> >
Cc: "fot" <fot at autox.team.net <mailto:fot at autox.team.net> >
Verzonden: Donderdag 30 augustus 2018 00:05:43
Onderwerp: [Fot] 89MM piston question

 

Do the guys running the 89MM pistons and liners need to relieve the liners to clear the intake valve, or does the extra MM make the difference?




Bob Kramer

 

On Tue, 


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