Reply With QuoteOK this is a pinto OK
so firstly it will have flat top pistons with Valve recess cut into them. deeping the recesses for a higher lift cam is a wast of time not only is hard on the pistons but there is little flow benefit. the Jap rods are used because they doint stretch as much and that's about all. they are longer but the pistons have the gudgeon higher or closer to the crown. this set up cuts down on wall friction thus gives you more GO for the same oomph.
because of the valve to crown relationship, high lift cams are not the go. infact imposable so we can forget about that. longer duration and longer over lap is whats done. but since there is no extra lift we can assume that springs would not be an issue, if a spring is broken then its broken, doint blame the cam.
since we doint know if its a dropped or burnt valve, well we can assume that its a burnt valve because if it was dropped valve you would be complaining about the oil running out though the hole in the sump ( probably)
longer duration needs a richer mix or you burn valves, some times pushing the spark forward and a wider spark curve.
worn cams, common, cam fail was the 1# death of these motors, Mr ford decided on using a silly bit of copper pipe in the head that just was not up to the job, im surprised that any one is still using a pinto much better to grab a sierra.
burnt valve, slow burning fuel on a lower compression with a long duration valve timing, running a bit lean ( IE not running rich) jeppa that will do it
Originally Posted by 85 county
Bookmarks