|
|
|
May 14, 2010 22:25:19 GMT
|
|
Do 1256 chevettes have hardened valve seats as standard to run on unleaded? I've been running the viva (with a chevette engine in) for some time now with wanton disregard to lead replacement fuel, but it seems to not have that much power these days (valve clearences checked). Cheers.
|
| |
|
|
|
|
|
May 14, 2010 23:57:27 GMT
|
You won't get as much oomf out of it as you would do from four-star because you can't run the ignition as far advanced. That said, it's been some time since you could get LRP anywhere so I'd hazard a guess the engine is getting a bit tired. Probably benefit from a set of bearings and rings, hokey valve grind and it'll be as good as new again  |
| |
|
|
|
|
|
|
|
|
Not 100% but I don't think they do, howerver the valves themselves are sodium rich (comparatively... or so I've been told) and hold up better than others to to lack of upper cylinder lubrication. Although obviously this can only go so far.
However I'm sure there'll be someone that knows more than I and can prove or disprove what I've been told.
HTH
|
| |
Faster. Faster. Until the thrill of speed overcomes the fear of death.
|
|
|
|
|
May 16, 2010 20:30:28 GMT
|
|
Yeah, I thought as much. Re ingintion adavance, I've just fitted Aldon Ignitor ignition to it and the timing is now a stange beast. With the ponits in, adavnce and retard would make a big difference. I think my flywheel must be out becasue it would run like a bag of poo if I set it dead on - anyway - with a good bit of advance I would run far better at the top end and lumpy on idle - and it would do about 90 but rubbish in traffic. Anyway, as a found out the other day, running adavnce with the ignitor made it sort of lumpy-ish on idle (not half as bad as before) but no difference to the top end. One thing though, it ran much hotter then usual and kept buring off water. Set to a bit of retard though, or more dead on (with my out of line flywheel -although I haven't tested this properly) it runs really smooth, keeps cool, but it will only do about 80 - and it's a struggle getting it there.
Does anyone else run ignitor ignition? and why would the engine run notably hotter with advance using ignitor - yet not run as fast as with advance on points?
Also, changing the rings wouldn't be the end of the world on the ohv engine, but at the same time, it drinks a lot of fuel when you hoof it. It cost me about £120-130 to drive down to Cornwall and back (at full throttle - 80 odd) which is about 21.8 mpg - and the plugs show good mixture so it might be a good idea to change it for something better for the long run. What sensible options gould I swap it for to make it go some, yet stick with the same back axle and running gear (minimal cost and faffing)?
|
| |
|
|
