<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>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 2<sup>nd</sup> 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.</p><p class=MsoNormal>Ken </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:fot@autox.team.net">Philip Gott via Fot</a><br><b>Sent: </b>Saturday, February 4, 2023 5:28 AM<br><b>To: </b><a href="mailto:tr4racing@googlemail.com">tr4racing@googlemail.com</a>; <a href="mailto:fot@autox.team.net">Friends Of Triumph</a><br><b>Subject: </b>Re: [Fot] Pistons</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<o:p></o:p></p><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal>You choose your path and make it work, just “don’t be beaten by equipment!”<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Phil Gott<o:p></o:p></p><div><p class=MsoNormal>Sent from my iPhone<o:p></o:p></p></div><div><p class=MsoNormal><br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal style='margin-bottom:12.0pt'>On Feb 4, 2023, at 3:06 AM, Chris Marx via Fot <fot@autox.team.net> wrote:<o:p></o:p></p></blockquote></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal><o:p></o:p></p><p class=MsoNormal><span lang=DE>Hi Tony,</span><o:p></o:p></p><p class=MsoNormal><span lang=DE> </span><o:p></o:p></p><p class=MsoNormal>regardless what the manufacturer says I set forged pistons on 0,13mm clearance.<o:p></o:p></p><p class=MsoNormal>Runs forever, never any issues, no piston slap. That’s my engine man recommended and so we did.<o:p></o:p></p><p class=MsoNormal>My TR4 runs on the same pistons now for 10 years with one change of rings inbetween.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>On aluminum engines – different story.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Cheers<o:p></o:p></p><p class=MsoNormal>Chris<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span lang=DE>Von:</span></b><span lang=DE> Fot <fot-bounces@autox.team.net> <b>Im Auftrag von </b>Tony Sheach via Fot<br><b>Gesendet:</b> Freitag, 3. Februar 2023 17:44<br><b>An:</b> DAVE HOGYE <dlhogye@comcast.net><br><b>Cc:</b> Erik Jacobsen via Fot <fot@autox.team.net><br><b>Betreff:</b> Re: [Fot] Pistons</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Hi folks <o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>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 ?<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>What’s the advice from the wise ?<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Regards<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Tony <o:p></o:p></p><div><p class=MsoNormal>Sent from my iPad<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><br>On 3 Feb 2023, at 16:22, DAVE HOGYE via Fot <<a href="mailto:fot@autox.team.net"><span style='color:#0563C1'>fot@autox.team.net</span></a>> wrote:<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333'>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. </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#333333'>Dave H. </span><o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>On 02/03/2023 4:41 AM Erik Jacobsen via Fot <<a href="mailto:fot@autox.team.net"><span style='color:#0563C1'>fot@autox.team.net</span></a>> wrote: <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Helvetica",sans-serif'> </span><o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'> <o:p></o:p></p></blockquote><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br><a href="mailto:fot@autox.team.net"><span style='color:#0563C1'>fot@autox.team.net</span></a><br><br><a href="http://www.fot-racing.com"><span style='color:#0563C1'>http://www.fot-racing.com</span></a><br><br>Donate: <a href="http://www.team.net/donate.html"><span style='color:#0563C1'>http://www.team.net/donate.html</span></a><br>Archive: <a href="http://autox.team.net/archive"><span style='color:#0563C1'>http://autox.team.net/archive</span></a> <a href="http://www.team.net/pipermail/fot"><span style='color:#0563C1'>http://www.team.net/pipermail/fot</span></a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/tony.sheach@live.co.uk"><span style='color:#0563C1'>http://autox.team.net/mailman/options/fot/tony.sheach@live.co.uk</span></a><br><br><br><o:p></o:p></p></div></div></div></blockquote></div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:.5in;margin-bottom:12.0pt;margin-left:.5in'>_______________________________________________<br>fot@autox.team.net<br><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.html<br>Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/vfracing@aol.com<br><br><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>