XR2 Technical data

[Mike_G]

Hi guys,

This time I need some technical data sheets for XR2
I need info like bore and stroke of orginal pistons and distance between piston and cylinder

Serial number is OD181454

Can anyone help?? Where Can I buy one?? Or maybe someone can scan it to me and mail it??

Cheers
Mike

[BluFin]

Here is something for a 150 V6 was also the first XR2 might be of some use 59mb download
Click Here for the pdf 58.8 mb

[Techteam]

Bore is 79.38 + - 0.10
Stroke is 67.31 + - 0.30

[Mike_G]

Originally Posted by Techteam

Bore is 79.38 + - 0.10
Stroke is 67.31 + - 0.30

is that in milimeters??

Do you know what is the tolerance in distance between piston and cylinder??

Thanks
Mike

[Techteam]

Yes that's mm

Piston is 79.12 mm

Ring Gap between .45 and .65 mm

We have found with the genuine ART piston that it swells up more than the older design and if the bore is bang on spec and you rev it hard it traps the rings relatively quickly. However you say you have a nikasil bore, which I don't understand and I don't recommend honing it with a handtool.

[Mike_G]

Thanks for all your answers TechTeam

Don't worry I won't honig it by handtools

Can you please tell me one more thing please

What are sizes of oversize pistons made by Mercury??

Will it be 79.27 and next size 79.42 ??
Or is it something else??

Mike

[Techteam]

No

79.50mm would be 15 thou over

79.88mm would be 30 thou over

Sorry to mix up imperial and metric but most people understand +015 or +030

We normally go straight to +030 but that's just to gain the cc's

So who nikasilled your motor then ? I'd check to see if that is allowed.

[Mike_G]

Ok so I don't quite understend, I thought that XR2 Racing have nickasil as standard. Noone did that. Just have to polished (honig - if I do undestand that word ) cylinder.

How can I check if it is Nikasil or not??

[Techteam]

I think you will find you don't have a nikasil motor. Visual inspection Nikasil would be a pale gold colour and retains it's crosshatching very well because it wears so well. Standar bore would be dull silver/grey much like a steel liner.

[Mike_G]

Thanks for all your help TechTeam, I will check the engine for nikasil at the weekend when I will have more time

Got to ask one more think (hope last one) do you know what is the sieze of needle bearing between crank shaft and connectin rods?? It's thikness.

Mike

[Techteam]

No because they are a caged unit, you cannot change the rollers as they are crimped in. As it is a bottom guided rod use the genuine parts I promise you it will work out cheaper than a new block.

[Mike_G]

Don't worry mate all parts will be genuine, just want to know if I have to buy new connecting rods or not