al695 wrote:Otherwise is anyone in the market for a 3cyl Robin Hood.
The cost is what's got me concerned, too. The best I could find easily is £655, inc. vat, for a set of forged ones:
http://www.cambridgemotorsport.com/pistons/je322669.
So with TR7 pistons only about £200-230 a set, they've got to be a seriously tempting alternative. The problem with using TR7 ones, would be that you've some work to check the head's not skimmed too far - from that other post:
trackerjack wrote:It would appear that if you fit the head with no gasket and turn it carefully by hand if it does not touch you have a winner.
And even if it has been over-skimmed, I would hope you can get the valve cut-outs cut for a bit less than £300 a set - 'spose it depends how many you do at once.
The other thing with fitting TR7 pistons is that you should be able to reduce the compression a bit, so that you can run safely on ordinary unleaded. I know there are those who reckon you can do that by just re-profiling your distributor advance curve, but I think I'd feel a bit happier doing it by having less compression. There will be some loss of power - however you do it -, but in something like the Robin Hood, I bet you won't notice on the road. If it's a completion or trackday car, I would have thought you want the forged pistons anyway.
It's a shame Rimmers are only knocking out the US spec low compression TR7 pistons for £56.50 a set in std size. I wonder what their standard size used blocks are like for 120 quid? In need of a rebore, I should think.
Graham
The 16v Slant 4 engine is more fun than the 3.5 V8, because you mostly drive it on the upslope of the torque curve.
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
... Still Sprintless.
