quote:
Originally posted by wbute
Diesel oil in a petrol engine? It has a detergent in it. I would be careful using that. Oil is cheap, engines are not.
diesel oil is primarily used because of its higher zinc content, removed from petrol engines because the cats dont like it.
A lot of diesel oils have reduced the zinc content so its almost of no benefit any more, needs to be a specific oil probably labelled "off road use only" or "for old s***boxes" to satisfy the epa and keep our engines alive.
Not really relevant to a tired old stocker i suppose, but put some spring on a decent flat tappet and its crucial.
I think penrite do an added zinc oil, and im pretty sure harley davidsons use a blend that still has plenty of zinc in it.
quote:
Anything electrical has to save HP. The alternator has to run on and off regardless so the power it robs the engine to run cant be saved anyway
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Not really, on an old car with electric fans fitted you can see the power being robbed every time the fans start up and teh idle drops because the demand for electricity has increased over "normal".
you dont see it on late model stuff because they cheat and open an air bypass to bring the rpm back up so you dont notice but it sure as hell is using more power than before
quote:
The only way to really know is to try changing some things and put it on the dyno.
this i agree with, but such small gains are barely measurable while discounting all other affecting incidents. A chassis dyno sure as hell isnt close to accurate enough, maybe an OEM engine dyno with a million dollars in sensors and software and a lab full of geeks to interpret the data.
I like to see chunks of 10hp before i pay any attention to it.
11.38@117
Edited by user Tuesday, 20 April 2010 6:36:27 AM(UTC)
| Reason: Not specified