Re: Conrod kits ?
Posted: Wed Mar 06, 2019 11:13 pm
Hi all,
Just an update, I now have Samarin rod kits in stock.
I have inspected one of the 30mm rod kits and all checked out okay. Variation in diameter over the pin bearing area was within 2 or 3 microns and maximum variation in the big end eye 6 microns ( approx 2 1/2 tenths). My conclusion is that the rod I measured was dimensionally far superior to pattern rods of old from Italy and probably comparable or better than original. As Eldert mentioned a few marks here and there on the rod shank, but nothing that's a functional issue. Accuracy not as good as my Arrow kits, but then they are a fraction of the price.
I will also add most Carrillo rods for Ducati I have measured have 6 or 7 tenths variation when new. Maybe I should not mention that many used Carrillo rods have 1.5 thou variation in the big end eye, that's 38 microns!! Okay this obviously doesn't mean Samarins rods are compatible strength wise, but I mention it more as a comparison for perceived quality.
Clearance is on the tight side, at about 0.015 to 0.02mm ( 6 to 8 tenths). That is very comparable to original kit clearance and perfectly acceptable for road use.
Bearing is 30/38/18 and has 18 x 4mm rollers. The cage is silver plated steel, similar to the bearing I use for my Arrow kits, just with one less roller (but same amount of rollers as original)
So, so far so good. Looks like an affordable replacement for road use. I'm sure they will find their way into race engines.............
I will hopefully be extending the kits to include 125/160 soon and hopefully if all goes well commission some N/C 250/350 kits.
Best Wishes
Nigel
Just an update, I now have Samarin rod kits in stock.
I have inspected one of the 30mm rod kits and all checked out okay. Variation in diameter over the pin bearing area was within 2 or 3 microns and maximum variation in the big end eye 6 microns ( approx 2 1/2 tenths). My conclusion is that the rod I measured was dimensionally far superior to pattern rods of old from Italy and probably comparable or better than original. As Eldert mentioned a few marks here and there on the rod shank, but nothing that's a functional issue. Accuracy not as good as my Arrow kits, but then they are a fraction of the price.
I will also add most Carrillo rods for Ducati I have measured have 6 or 7 tenths variation when new. Maybe I should not mention that many used Carrillo rods have 1.5 thou variation in the big end eye, that's 38 microns!! Okay this obviously doesn't mean Samarins rods are compatible strength wise, but I mention it more as a comparison for perceived quality.
Clearance is on the tight side, at about 0.015 to 0.02mm ( 6 to 8 tenths). That is very comparable to original kit clearance and perfectly acceptable for road use.
Bearing is 30/38/18 and has 18 x 4mm rollers. The cage is silver plated steel, similar to the bearing I use for my Arrow kits, just with one less roller (but same amount of rollers as original)
So, so far so good. Looks like an affordable replacement for road use. I'm sure they will find their way into race engines.............
I will hopefully be extending the kits to include 125/160 soon and hopefully if all goes well commission some N/C 250/350 kits.
Best Wishes
Nigel