Model 170

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Charles uk
Posts: 4094
Joined: Wed Feb 27, 2008 4:38 pm
Location: Maidenhead Berks UK

Re: Model 170

Postby Charles uk » Wed Aug 23, 2017 2:46 pm

The design of the 170/125/160 conrod was quite different to the classic/QB rod, the 170 rod had a phosphor bronze shell bearing in the top half of the big end but had a cast aluminium big end cap machined to be the bearing, meaning that they didn't have the benefit of a bronze bearing surface!

All of the 170 series motors were designed to run on a 25:1 oil mix, if your still running the original rod I don't think it would hurt to change that to 20:1 as part of your insurance policy, & strip & check the big end clearances before starting straight after purchase.

Out of the 10 or so of the 170 series I've owned, half have had big end clearances over 5 thou, (easy to measure with Plasti Gauge) necessitating new rods & cranks, I still have a couple of new cranks, if anyone needs one.

Check the main bearings, as they are known to wear more than expected, I have some new ones of those as well

Here's pictures of 2 new, unused 170 rods, with & without bronze end caps!
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Make it idiot proof and someone will make a better idiot.

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Oyster 49
Posts: 2746
Joined: Tue Oct 26, 2010 6:55 pm
Location: Erfurt, Germany

Re: Model 170

Postby Oyster 49 » Wed Aug 23, 2017 5:13 pm

If you are planning to work a 170 hard, then this would be a very good investment!

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Charles uk
Posts: 4094
Joined: Wed Feb 27, 2008 4:38 pm
Location: Maidenhead Berks UK

Re: Model 170

Postby Charles uk » Wed Aug 23, 2017 6:22 pm

Only have bearings & cranks left, 2 crankshafts, & maybe 6 pairs of main bearings.

The 2 new rods are patterns in case I get orders for 10 more, but please bare in mind that £120 was the price 5 years ago, but I do have enough investment castings left for 10 more, there was a minimum order value for the wax moulds & the casting work.
Make it idiot proof and someone will make a better idiot.


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