[Fot] 89MM piston question
Bill
Bill at ponostyle.com
Sun Sep 2 22:00:54 MDT 2018
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> 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
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>>
>>
>> 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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