Author |
Message |
Buellistic Samba Member
Joined: February 04, 2011 Posts: 357 Location: Albuquerque, New Mexico
|
Posted: Wed May 25, 2011 6:55 pm Post subject: An interesting development |
|
|
The engine a picked up to rebuild into a 1776cc is apparently already a 1776...
I was looking at the heads today and thinking to myself "How are they going to bore these out? There's not much meat there..." so I measured the bore. It was 96mm or so (just had a ruler on me).
I feel like it's a case of too good to be true, so I have to ask. Is 96mm the right bore for the 90.5mm p&c's? I measured the cylinder's inner diameter and it's 90.5. That means about 5.5mm of cylinder wall.
I guess my last question is how to tell if the old pistons and cylinders are in good enough shape to re-use. |
|
Back to top |
|
|
modok Samba Member
Joined: October 30, 2009 Posts: 26743 Location: Colorado Springs
|
Posted: Wed May 25, 2011 7:07 pm Post subject: |
|
|
90.5 cylinders are 98 mm at the top
the stock cylinders fit a 94mm hole
There was one kind of machine-in 88 made that would fit a 96mm hole, but it isn't likely you have those.
better check again |
|
Back to top |
|
|
nsracing Samba Member
Joined: November 16, 2003 Posts: 9437 Location: NOVA
|
Posted: Wed May 25, 2011 7:19 pm Post subject: |
|
|
If you see a ridge up top on the inside of the cylinder then you have a well-worn engine. The pistons might still be okay, if the cylinders are worn might as well buy new set P/Cs.
Tear it all the way down and see if it is loaded on the lower end too. Are the heads big valves?
Might even have a cam and good oil pump in there.
Last edited by nsracing on Wed May 25, 2011 7:48 pm; edited 1 time in total |
|
Back to top |
|
|
Buellistic Samba Member
Joined: February 04, 2011 Posts: 357 Location: Albuquerque, New Mexico
|
Posted: Wed May 25, 2011 7:34 pm Post subject: |
|
|
Yeah, I got it figured out. Never trust a 13 year old to measure ANYTHING.
I don't have a garage where I live, so I just have the heads. The rest is waiting to be torn down at my parents' house. I asked my younger brother to measure the inner diameter of the cylinders and he said 9cm.
He measured the wrong part.
My mother measured it and got 85-86mm inner diameter.
Damn. |
|
Back to top |
|
|
RockCrusher Samba Member
Joined: August 03, 2010 Posts: 4596 Location: Parkesburg, PA
|
Posted: Wed May 25, 2011 7:37 pm Post subject: |
|
|
Your brother will make a fine carpenter someday but not a cabinet maker coz they use the "little" marks on the ruler while the carpenters only use the big marks.........
RC _________________ [email protected] Please use email for all general inquiries.
I will be happy to speak to anyone who has a serious inquiry (meaning real potential business for RC enterprises) or a parts order. Due to machining noise causing missed calls all calls will be returned promptly. |
|
Back to top |
|
|
Perranfulo Samba Member
Joined: July 21, 2006 Posts: 42 Location: Chula Vista, Ca
|
Posted: Wed May 25, 2011 7:40 pm Post subject: |
|
|
Always trust your mother, never trust your brother--fact of life! |
|
Back to top |
|
|
nsracing Samba Member
Joined: November 16, 2003 Posts: 9437 Location: NOVA
|
Posted: Wed May 25, 2011 7:51 pm Post subject: |
|
|
Why don't you just scrape the top of the pistons. There will be mark or size stensiled on there.
Might not be 90.5mm but a 85.5mm (stock 1600cc) |
|
Back to top |
|
|
mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
|
Posted: Thu May 26, 2011 12:37 pm Post subject: |
|
|
nsracing wrote: |
Why don't you just scrape the top of the pistons. There will be mark or size stensiled on there.
Might not be 90.5mm but a 85.5mm (stock 1600cc) |
too easy . |
|
Back to top |
|
|
|