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| 1300 CRANK INTO S BLOCK https://www.ausmini.com/forums/viewtopic.php?f=5&t=43808 |
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| Author: | 73GT [ Sat Jul 12, 2008 1:38 pm ] |
| Post subject: | 1300 CRANK INTO S BLOCK |
Hi I have a S block bored to 74.7mm & has had 10mm off the deck to allow Triumph pistons. As i dont have a S crank i want to use a 1300 item. Vizard mentions that to do this i need thicker thrust washers. Does anyone know where to get them? Minispares had a part number for these but A search fines nothing Also will a 1300 crank & rods on a std 81.3mm stroke spin in the S block without hitting anything or do i need S rods also? thanks for any help |
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| Author: | drmini in aust [ Sat Jul 12, 2008 4:23 pm ] |
| Post subject: | Re: 1300 CRANK INTO S BLOCK |
73GT wrote: Hi
I have a S block bored to 74.7mm & has had 10mm off the deck to allow Triumph pistons. As i dont have a S crank i want to use a 1300 item. Vizard mentions that to do this i need thicker thrust washers. Does anyone know where to get them? Minispares had a part number for these but A search fines nothing Also will a 1300 crank & rods on a std 81.3mm stroke spin in the S block without hitting anything or do i need S rods also? thanks for any help Q1. www.minis.com.au has ACL thrusts in +.030" size. p/no is 2T2204+.030 Q2 It'll spin OK. If using the 1100S/1275LS style big journal rods I would lighten the lumpy caps heaps, and I would wedge the crank too, as their counterweighting is dreadful. |
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| Author: | 73GT [ Sat Jul 12, 2008 7:02 pm ] |
| Post subject: | |
Thanks again Kev, looks like this will be a future project for me now. Crank & rods will be lightened as you suggest. Also the crank & cam will be nitrided. I dont read much about this being done on the Ausmini forum, is this common practise for performance mini engine building, for the nominal cost i think it is worth it NZ$30 for cam NZ$100 for crank a couple of yrs ago on my last engine |
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| Author: | drmini in aust [ Sat Jul 12, 2008 8:13 pm ] |
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According to heat treatment stuff I've read and Graham Russell, `nitriding' doesn't work on EN16 cranks. These should be tufftrided, or nitro-carburised instead. Tufftriding process here in Oz has pretty much been closed down for environmental reasons. As for nitriding Mini cams, I'm not sure what their steel grade is. For nitriding to work, the steel needs either vanadium or aluminium content. |
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| Author: | 73GT [ Sun Jul 13, 2008 4:48 pm ] |
| Post subject: | |
The heat treatment people over here use a modern gas longrun process that will produce a hard white layer on a alloy steel like EN16, the layer is a lot thinner than on nitriding steels but apparently still of benefit. |
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