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| | [2 Stroke] How plug up a 2-stroke wristpin? | |
|
+13Seb4LO Ian Harrison Howard Gifford GtG001 cristogrr Frits Overmars Vortex Tomi Bob van der Zijden Marc Kentai Jan Thiel Filandro 17 participants | |
Auteur | Message |
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Ian Harrison
Nombre de messages : 100 Localisation : United Kingdom Date d'inscription : 28/08/2012
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Dim 1 Juin 2014 - 3:10 | |
| Hi All On our new 250cc single Superkart motor, before going to large amounts of trouble in manufacturing a permenant method of plugging the piston pin and closing the cavity between the end of the pin and the edge of the piston, we used this simple plug arrangement to test. The pin is 18mm O/D and 13mm I/D. the head of the allen bolt sits into a counter-bore so it is flush with the plug. [Vous devez être inscrit et connecté pour voir cette image]The assembly weighs less than 15 grams and we were able to machine the interior of our prototype pistons so that the complete piston assemblies used for the test (with the plug) and for the control (without the plug) were identical weights. You can see that the assembly clamps either side of the right-hand circlip, therefore can't move side-to-side in the piston. The wider step on the left-hand side means that it doesn't clamp on the left-hand circlip which might cause unwanted stress. The bolt is an M4 and we used medium strength Loctite to retain it. It stayed in place admirably for perhaps 20 minutes total running including about 10 dyno runs both single top gear runs and through the gear runs, allowing the engine to run out of overrev at the end of each run. I was able to remove the assembly quite easily straight after the last run (it was still quite hot), by digging the point of the pointed tool that I usually use for circlip fitting/removal into the side of the threaded portion via the pin installation slot. I wouldn't recommend it as a permanent solution, but fine for testing. We learnt everything we needed to know and will proceed accordingly. Best Regards Ian |
| | | Seb4LO
Nombre de messages : 2607 Localisation : Concarneau Date d'inscription : 05/07/2009
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Lun 2 Juin 2014 - 11:27 | |
| hello Ian , i'm having problem with carbon reeds ( cr250 ), , Vf3 and stock cages with 4 or 6 windows in KitA 125 honda engine ( not production cases )
have you any special reeds to get high rpm for me or any tip welcome as they are to light on tension to work correctly ...
thanks
Seb |
| | | JanBros
Nombre de messages : 351 Localisation : Belgique Date d'inscription : 05/12/2011
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Dim 25 Jan 2015 - 3:24 | |
| been reading on the RD/RZ forum, and aparently Tony Doukas from TDR-racing (http://www.tdrrz.com/) makes them from titanium. [Vous devez être inscrit et connecté pour voir ce lien]midle of the page in his 1. answer. EDIT : apparently it was something he did some time ago to increase crankcase compression, not to avoid interference between aux and transfer.
Dernière édition par JanBros le Lun 26 Jan 2015 - 0:32, édité 1 fois |
| | | Vortex
Nombre de messages : 41 Localisation : Luxembourg Date d'inscription : 26/11/2013
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Dim 25 Jan 2015 - 21:35 | |
| - Ian Harrison a écrit:
- Hi All
On our new 250cc single Superkart motor, before going to large amounts of trouble in manufacturing a permenant method of plugging the piston pin and closing the cavity between the end of the pin and the edge of the piston, we used this simple plug arrangement to test. The pin is 18mm O/D and 13mm I/D. the head of the allen bolt sits into a counter-bore so it is flush with the plug.
[Vous devez être inscrit et connecté pour voir cette image]
The assembly weighs less than 15 grams and we were able to machine the interior of our prototype pistons so that the complete piston assemblies used for the test (with the plug) and for the control (without the plug) were identical weights.
You can see that the assembly clamps either side of the right-hand circlip, therefore can't move side-to-side in the piston. The wider step on the left-hand side means that it doesn't clamp on the left-hand circlip which might cause unwanted stress.
The bolt is an M4 and we used medium strength Loctite to retain it. It stayed in place admirably for perhaps 20 minutes total running including about 10 dyno runs both single top gear runs and through the gear runs, allowing the engine to run out of overrev at the end of each run.
I was able to remove the assembly quite easily straight after the last run (it was still quite hot), by digging the point of the pointed tool that I usually use for circlip fitting/removal into the side of the threaded portion via the pin installation slot.
I wouldn't recommend it as a permanent solution, but fine for testing. We learnt everything we needed to know and will proceed accordingly.
Best Regards
Ian Hi Ian, What did you see on the dyno with the pluged pin? THX |
| | | Ian Harrison
Nombre de messages : 100 Localisation : United Kingdom Date d'inscription : 28/08/2012
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Lun 26 Jan 2015 - 1:34 | |
| Absolutely no difference with or without Best Regards, Ian |
| | | dutch fisher
Nombre de messages : 19 Localisation : England Date d'inscription : 07/09/2012
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Lun 26 Jan 2015 - 14:19 | |
| Ian,
How far around the bore do your exh aux go? |
| | | Ian Harrison
Nombre de messages : 100 Localisation : United Kingdom Date d'inscription : 28/08/2012
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Mar 27 Jan 2015 - 3:24 | |
| Hi Dutch Approx half way, i.e. to c/l of piston pin. Ian |
| | | pierre95
Nombre de messages : 111 Localisation : val d'oise Date d'inscription : 14/12/2010
| Sujet: Re: [2 Stroke] How plug up a 2-stroke wristpin? Jeu 29 Jan 2015 - 21:42 | |
| - Seb4LO a écrit:
- hello Ian , i'm having problem with carbon reeds ( cr250 ), , Vf3 and stock cages with 4 or 6 windows in KitA 125 honda engine ( not production cases )
have you any special reeds to get high rpm for me or any tip welcome as they are to light on tension to work correctly ...
thanks
Seb Hi Seb Concerning my "light" experience on carbon reeds on TZ125 1994 engine so a six windows box and also 125 RM engine 2003 with stock 4windows i can tell you that my aim is always to have at full open valve on stoppers or on crankcase a load at 225gr. Each time i try lower lower i broke valves( for sure at 175gr!). For it i use carbone fiber and i shape it by myself, the thickness i use is 0.4 or 0.45mm, i also orientate the fiber at 45° and the external cutting is not as common reeds. Using this method alow to decrease stiffness without being oblige to use very thin carbon reeds.For 250 MX engines RM and CR i don't remeber yet the load value i used but for sure stiffer than for 125 , i could try ty look at my very old notes about it if you are interested, which are certainy somewhere in my workshope!!!! With this vaue at 225gr the TZ engine with Titanium crankshaft was able to overrev at 14800trs Pierre |
| | | Fábio Mendes
Nombre de messages : 1 Localisation : Portugal Date d'inscription : 25/07/2019
| Sujet: Pistin pin plugs. Sam 3 Aoû 2019 - 18:23 | |
| Hello my name its Fábio Menndes and im new on this forum thanks for acept me, on question on piston pins ended plugs im about to asking anyone tried cooked cork? im not mechanic engineer or preparator only love 2 strokes and tried to understand him better. |
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