[Fot] Pistons

Sat Feb 4 07:41:48 MST 2023

You can easily run .0025-.003 clearance with forged and coated pistons if you have a torque plate, a machine shop with the proper equipment to hone the liners, the right oil and a cooling system that works.  Blueprinting the block cooling passages is a big factor in this.  My last engine had +50 full races + qualifying and practice with 3% leak down on the rings.  Valves needed attention several times before bottom end.  Striped ring gear in 2nd under power spun at motor to 8,700 rpm where cam broke.  While bottom held and still turned the result ended that motor for good.  You simple blueprint TR engines like a Small Block Chevy V8 race engine.  They have done all the tech and developed all the parts.  That’s my 2 cents.
Ken 

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From: Philip Gott via Fot
Sent: Saturday, February 4, 2023 5:28 AM
To: tr4racing at googlemail.com; Friends Of Triumph
Subject: Re: [Fot] Pistons

Everyone making good points, but just to throw this out there: we’ve built a couple of “budget” engines with cast flat top pistons to good effect.  We shift at 6000 and have good life and good power (over 140 Hp at the wheels). So you can run those with no fear if set up correctly.
With forged pistons set to proper clearance we would expect less sliding friction and hence more power ( the pistons are the single biggest area of friction-based parasitic loss in an engine) due to both slipper design and less distortion under load for forged pistons.  Have been building an engine with Arias pistons (yes, they are now owned by Carillo) - it’s been a work in progress for a while, and Dave now running Wiseco pistons.
You choose your path and make it work, just “don’t be beaten by equipment!”
Phil Gott
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On Feb 4, 2023, at 3:06 AM, Chris Marx via Fot <fot at autox.team.net> wrote:

Hi Tony,

regardless what the manufacturer says I set forged pistons on 0,13mm clearance.
Runs forever, never any issues, no piston slap. That’s my engine man recommended and so we did.
My TR4 runs on the same pistons now for 10 years with one change of rings inbetween.

On aluminum engines – different story.

Cheers
Chris

Von: Fot <fot-bounces at autox.team.net> Im Auftrag von Tony Sheach via Fot
Gesendet: Freitag, 3. Februar 2023 17:44
An: DAVE HOGYE <dlhogye at comcast.net>
Cc: Erik Jacobsen via Fot <fot at autox.team.net>
Betreff: Re: [Fot] Pistons

Hi folks 

I have a set of Wiseco 89mm pistons that i bought maybe 10 years ago I was going to use in a torquey rally engine with a set of Carillo rods - is there an issue with piston / liner clearances as some have said ? Or is it just a question of not letting the engine run over hot ?

I have Venolia’s in my other bigger capacity engine and they have been great, but I’m not so sure about Uk supply any more. They also needed the longer Carillo rods, so if I go that route I end up with a set of pistons I don’t need.

What’s the advice from the wise ?

Regards

Tony 
Sent from my iPad

On 3 Feb 2023, at 16:22, DAVE HOGYE via Fot <fot at autox.team.net> wrote:

I believe that J&E owns Wiseco.  The Kipp family in Ohio started Wiseco and owned it until a few years ago.  I found this out when I called J&E about ordering pistons, or I called Wiseco.  Can't remember who I called first.  Tom Kipp was a top AMA Super Sports and Super Bike racer during the '90s.  Wiseco was a big sponsor of AMA and might still be.  I installed a Wiseco 1200cc piston kit in my '93 H-D Sportster way back in the '90s.  
Dave H.  
On 02/03/2023 4:41 AM Erik Jacobsen via Fot <fot at autox.team.net> wrote: 

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