View Full Version : Z20LET bottom end upgrade ??
What would you do to a bottom end so it could handle over 300bhp with easy.
I was thinking
Low compression Pistons
Oil spray bars
ARP bolts
as a basic upgrade.
What is the main reasion for fitting rods ?? I thought they were for high reving engines but doesnt really happen on a turbo engine 6750-7000 on average. Unless you have a turbo the size of a dustbin lol
Is it worth uprating the valve springs also ??
post away :D
would you be just as well off with a vxr bottom end - spray bars in that and sure the pistons maybe better too
but the only problem is Vauxhall arnt doing a VXR short block yet :(.
I am sure when they do demand is going to be very high
by that do you mean you have to buy the whole engine block (excuse my lack of technical wordage)
i seem to remember someone on migweb fitting spray bars to there block themselves - maybe worth a search ;) possibly on an xe or c20 but gives you an idea
tall/long is block and head short is just block :)
ah i was correct then - learnt summit new today ;)
Yer I saw that thread as you can get the VXR oil sprays from vauxhall for cheap money.
didnt someone have the vxr bottom end on here
scottyboy had the whole engine - dont know anyone else to have fitted just a bottom
jamesmurray
28-02-2007, 20:20
it all depends on where you want the 300bhp+ to be. if its like standard, with a big torque hit at 3k, then you will need stronger rods and pistons. if its 300+bhp at high rpms with a lower torque spread, then id jsut go for uprated arp rod bolts and air-air oil cooler. at higher rpms theres less shock load on the engine, which is where you bend rods.
jimbo
Any one ever heard of a bent rod ??
about a year ago there was a zlet block on ebay with a bent rod i was going to buy before i bought mine, bit of useless info tbh
Turbo Keith B
28-02-2007, 22:29
Courtenay are doing a bottom end rebuild now. But don't know how much it is. Low com piston's, spray bar, rod's, bolts, fully ballanced etc.
I am up there in a coupe of weeks so will see what they say :)
Have just seen this on courtenays website,it says price is between 3-4k depending on engine condition
Z20LET Engine Rebuild
Z20LET engine being stripped down and rebuilt to a much higher specification, using uprated high yield forged pistons, uprated steel rods with ARP rod bolts, the addition of under piston cooling (oil spray jets), lightened and balanced internals including crankshaft, flywheel, pistons and rods, the removal of the counter rotating balancer shafts (VXR Z20LEH specification) and re-fitting with new oil pump, water pump, cambelt, tensioners, bearing, stem seals, and gaskets.
Prices range from £3,000 - £4,000 (including parts and labour to remove the engine from the vehicle, disassemble and reassemble it, all the required maching work and refitting in the engine bay) depending upon specification as each engine is rebuilt to individual requirements and quoted according to required specification.
welsh-andy
28-02-2007, 23:53
3-4k heck of a lot of cash though,cheaper to buy a z20leh and do a conversion would have thought
For the price of Steel rods for the LET/XE engines these days(£350 with ARP bolts) I would definately fit them.
aberdeenGSI
01-03-2007, 12:01
At the end of the day you get what you pay for so 4k is not to bad imo :cheesy:
Scottyboy
01-03-2007, 16:39
LEH replacement is 4.5k, + you get your ZLET lump to sell on.
Still might be better to rebuild the standard one and it will be more bullet proof than the LEH ones
Wonder how much it would cost if you under took most of the work your self ??