Conrod kits ?

Ducati single cylinder motorcycle questions and discussions, all models. Ducati single cylinder motorcycle-related content only! Email subscription available.
Moderator: Morpheus

Moderator: ajleone

LaceyDucati
Posts: 521
Joined: Sun Sep 19, 2010 10:30 pm
Location: Wales UK
Contact:

Re: Conrod kits ?

Postby LaceyDucati » 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

Bevel bob
Posts: 1043
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: Conrod kits ?

Postby Bevel bob » Thu Mar 07, 2019 7:32 am

That's good news especially now with the loss of Alpha .

Geordie
Posts: 141
Joined: Thu Jan 16, 2020 12:15 pm
Location: Mallorca, Spain

Re: Conrod kits ?

Postby Geordie » Mon Nov 30, 2020 6:13 pm

An interesting thread.

I have the details for a Mototrans rod, pin and bearings set from Samarin:-

DU-251ECM . Ducati 175cc-200cc-250cc . Special machined crank with competition silver cage. All our connecting rods are supplied complete: (connecting rod, piston cage, crankshaft cage, crankshaft pin and washers)

As far as I can ascertain, for my Spanish Elite, there is the choice of this or the recambiousado one. The former uses a straight 27mm crankpin and the latter a stepped one as originally fitted. There are likely to be weight differences between the two.

I can see no problem with fitting either but then, I'm not a crank builder. I also wonder about vibration. Any experience thoughts or advice before I press an order button would be gratefully received. The Elite is being rebuilt as a restoration of a standard bike.

Duccout
Posts: 1285
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Conrod kits ?

Postby Duccout » Mon Nov 30, 2020 6:32 pm

What type was fitted to your crank originally? It would be easier to stick to the original pin, or you will have to have the crank rebalanced I believe. Hopefully Nigel or Eldert will see this and comment.

Duccout
Posts: 1285
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Conrod kits ?

Postby Duccout » Mon Nov 30, 2020 6:40 pm

BTW, the only Ducati rod kit that is listed on the Samarin web site is for a 50cc.

Geordie
Posts: 141
Joined: Thu Jan 16, 2020 12:15 pm
Location: Mallorca, Spain

Re: Conrod kits ?

Postby Geordie » Mon Nov 30, 2020 8:46 pm

Thank you for that. Yes, balancing, hence my question.
To search the Samarin site go to
http://www.samarin.net/?productos
There is a 'search product' box. Drop down menu to 4-strokes and then to Ducati.

themoudie
Posts: 649
Joined: Sat Jun 14, 2014 12:44 am
Location: Scotland

Re: Conrod kits ?

Postby themoudie » Mon Nov 30, 2020 10:17 pm

Aye Geordie,

I would send Nigel Lacey an email at https://laceyducati.com/ducati-parts/contact_us.html and see what he has to say.

If you are lucky Nigel might reply to this thread!

Good health, Bill

Scottish888
Posts: 266
Joined: Wed Feb 07, 2018 1:47 am
Location: Edinburgh, Scotland UK

Re: Conrod kits ?

Postby Scottish888 » Fri Feb 12, 2021 10:36 pm

I know its a bit late but I bought the Samarin kit (and a new Omega oversize piston kit) from Lacey Ducati summer 2019 and had the crank put together by a Laverda specialist in Glasgow, he also had the rebore done.
Both these kits look top class and of course lacey Ducati were very helpful with advice.
Engine was assembled and I've tried the bike summer 2019. The bike has a total cut out around 5000rpm but I will be replacing the original ducati eletronica ign with a standard points setup i've already bought. Can't wait to get it firing evenly all the way, roll on spring time.
duc samarin crank.jpg

duc omega piston.jpg
You do not have the required permissions to view the files attached to this post.


Return to “Ducati Singles Main Discussions (& How to Join)”

Who is online

Users browsing this forum: blethermaskite, dsmess, Google [Bot] and 48 guests