Fitting Chevy rods to Rover pistons
Moderator: phpBB2 - Administrators
Fitting Chevy rods to Rover pistons
I am fitting small journal Chevy rods to rover pistons, which obviously have different wrist pin diameters. I have searched through a lot of the threads on here with lots of detail about teflon buttons, having circlips fitted, etc...
I don't think circlips will work for me. There isn't a lot of material in the piston for that. I don't think buttons are going to work either because the insides of my wrist pins are tapered, and not very tidily either, so I won't be able to have nice fitting buttons made (unless I can find a new set of pins.)
So the only solution I can think of is to press fit an insert into the rod that will hold the pin in firm, instead of floating. I'm a bit wary about doing that though.
What do people think?
I don't think circlips will work for me. There isn't a lot of material in the piston for that. I don't think buttons are going to work either because the insides of my wrist pins are tapered, and not very tidily either, so I won't be able to have nice fitting buttons made (unless I can find a new set of pins.)
So the only solution I can think of is to press fit an insert into the rod that will hold the pin in firm, instead of floating. I'm a bit wary about doing that though.
What do people think?
-
- Top Dog
- Posts: 2334
- Joined: Sat Aug 18, 2007 5:09 pm
- Location: Sidcup, Kent, UK
-
- Top Dog
- Posts: 2334
- Joined: Sat Aug 18, 2007 5:09 pm
- Location: Sidcup, Kent, UK
I have to ask why the change to chevy rods and retain the relatively weak rover piston, are you changing the stroke as well?
You could swap the pistons for Keith Black Hypereutectic Chevy 305 items and bore the block to 3.736" + required clearance. presumably your using a 3.9 block as a base.
My engine is 3.9 bored to 3.736" 4.2 77mm.crank 5.85" chevy type rods machined to fit rover crank which gives 4.35L and retains revability.
Paul at V8 tuner does the modified rods which use standard Rover size shells, if you buy chevy rods they will need machining to narrow the width and require custom shells.
Kevin.
You could swap the pistons for Keith Black Hypereutectic Chevy 305 items and bore the block to 3.736" + required clearance. presumably your using a 3.9 block as a base.
My engine is 3.9 bored to 3.736" 4.2 77mm.crank 5.85" chevy type rods machined to fit rover crank which gives 4.35L and retains revability.
Paul at V8 tuner does the modified rods which use standard Rover size shells, if you buy chevy rods they will need machining to narrow the width and require custom shells.
Kevin.
-
- Top Dog
- Posts: 2334
- Joined: Sat Aug 18, 2007 5:09 pm
- Location: Sidcup, Kent, UK
Well unless you are changing stroke and need a different length rod, then I would just use the 3.9 rods as they should be perfectly adequate for all but full race use.
Paul responds better to a phone call.
Just checked and those 5.85" rods will not work with the pin height of the rover piston and would put the piston approx 150thou. out of the top of the bores, standard rover rods for 3.9 are 5.66" centre to centre.
Kevin.
Paul responds better to a phone call.
Just checked and those 5.85" rods will not work with the pin height of the rover piston and would put the piston approx 150thou. out of the top of the bores, standard rover rods for 3.9 are 5.66" centre to centre.
Kevin.
-
- Top Dog
- Posts: 2334
- Joined: Sat Aug 18, 2007 5:09 pm
- Location: Sidcup, Kent, UK
I spoke to Ian Richardson at Wildcat before I did mine and he said a 1mm. overbore was the limit so using the chevy piston is ok, bear in mind that you are only taking off just under 19 thou. from the thickness of the liner.minorv8 wrote:Chevy 305 bore is 3,736". is it possible to bore the Rover cylinders to that size, given that liners would not have too much materia left ? Anyone with practical experience ?
Kevin.
-
- Knows His Stuff
- Posts: 518
- Joined: Thu Nov 23, 2006 12:05 am
- Location: Nottingham, Notts, England, UK
- Contact:
-
- Knows His Stuff
- Posts: 518
- Joined: Thu Nov 23, 2006 12:05 am
- Location: Nottingham, Notts, England, UK
- Contact:
-
- Top Dog
- Posts: 2334
- Joined: Sat Aug 18, 2007 5:09 pm
- Location: Sidcup, Kent, UK