Re: Td42 Silvertop engines
Posted: 19 Oct 2017 19:22
Cedric, the determining factor for a silvertop is not whether it has a vacuum pump on the alternator or not or if it has a silver tappet cover or not but I think it was more a "hint" whether it may be a silvertop or not. The deteraming factor can only be the pistons as this is the only major difference between a turbo and non turbo engine.
As far as I know most (not all of them) GQ TD42's came out with a vacuum pump on the alternator and most are not silvertops. Only in the GU shape did they change to the vacuum pump on the
So yes one and only difference is the pistons. The crank, conrods, block, piston coolers are no different to any other NA TD42.
On the TI motor the conrods are a bit stronger and obviously the pistons are completely different, the piston coolers are a bit longer and actually push right into the cooling ports in the piston head and the off course the crank is thicker at the back where the flywheel bolts onto it.
So the silvertop gained its popularity because its the only NA engine you can safely turbo without frying the pistons and it now makes sense to me after having stripped both and comparing the parts.
I can guarantee you that Tommie's engine is a silvertop as the pistons are EXACTLY the same as the other silvertop I have here. The posability is off course always there that the timing cover was changed at some point to accommodate the vacuum pump under the diesel pump to be able to run an normal alternator. The car now has over 500,000km on so anything is possable.
As far as I know most (not all of them) GQ TD42's came out with a vacuum pump on the alternator and most are not silvertops. Only in the GU shape did they change to the vacuum pump on the
So yes one and only difference is the pistons. The crank, conrods, block, piston coolers are no different to any other NA TD42.
On the TI motor the conrods are a bit stronger and obviously the pistons are completely different, the piston coolers are a bit longer and actually push right into the cooling ports in the piston head and the off course the crank is thicker at the back where the flywheel bolts onto it.
So the silvertop gained its popularity because its the only NA engine you can safely turbo without frying the pistons and it now makes sense to me after having stripped both and comparing the parts.
I can guarantee you that Tommie's engine is a silvertop as the pistons are EXACTLY the same as the other silvertop I have here. The posability is off course always there that the timing cover was changed at some point to accommodate the vacuum pump under the diesel pump to be able to run an normal alternator. The car now has over 500,000km on so anything is possable.