thats a good way of putting it, torque would be good for around town as i hait the lag sumtimes, i was thinking of maybe going hi comp aswell to acheive a drivability, what would the bhp and torque be of a 1.8 zvh with std pistons and decop plate at 1 bar, i have heard the std pistons are only good for a bar.
I have a modded meterign unit to run 18 psi and big fmi could i run more then the 15psi or more advance or is it that the pistons simply cant take anymore power then a bars worth?
I wouldnt mind going 1.8 zvh decomp plate route as there cheep to make so ive heard so it wouldnt matter to much if it pod as the bottom end would only set me back £100.
Thanks for reply Paul.
well i have built a few 1.8's in the past and if ppl what a higher compression for day to day use i dont machine the pistons just leave then as is this will give you around 8.5:1 compression and will allow you to run up to 20psi but i wouldnt recommend it on that sort of compression , however my m8 was addement that he could push it further and is currently running a:
1.8zvh with a home done gas flowed head, kent cam and vernier pulley magnex exhaust, k +n and a std turbo putting out 23 psi
it wont last long (the turbo this is) but its putting out 195 at the wheels around 230 at the fly.
But as i said this is not recommended as the max i was recommended was 20psi on unmachined pistons , 14psi on 0.5mm machined pistons
however the 1st engine i built had 1mm machined off the pistons and was running 14psi for over a year by my self and i had no problems either but i had no other mods done to the car and was getting 147 @wheels (around 180 @fly).
If you wish to go down the decompression route with un machined pistons then i would say you could run the 14 too 20 psi range with out any problems as the lower compression will reduce the heat on the top of the piston crowns and will retain reliability when on boost.
and if all its going to cost is £100 all in what have you got to lose as you couldnt even get a set of pistons for a cvh for that sort of money
