Mattybr5@MB Developments

iTrader: (250)

can anyone tell me if a set ov Hydraulic Lifters fitted to a set ov sti heads are any good??

for some reason the heads are from my type r the cams and heads are sti items but there is Hydraulic Lifters fitted i wouls have tought they been underbucket items??

can any 1 give me some info on these type ov lifters are they any good??will they cope with the sti valve traimn and type ov revs ov a sti engine can do??thank you in advance

merlin24

iTrader: (1)

What Version heads have you got and what power are you aiming for ??

Version 1~2 had hydraulic heads, STi 3~6 have underbucket shims.
Original STi 2 hydraulic lifters are lightweight items approx. 10g lighter than the WRX one's.
STi V2 RA had Top Hat inner shims.

Hydraulic lifters run with pre-load against the cam and the solid lifters run with lash/clearance - the cam profiles are different in respect to the ramp rates/acceleration and you cant normally fit solid lifter cam's to hydraulic valvetrain.

Hydraulic lifters also tend to be inconsistant due to the effect of the oil temp/viscosity,pressure and rpm so are not really suited to 'big power' engines.


Mick

Mattybr5@MB Developments

iTrader: (250)

cheers for the reply mick id hoped you would see this

for some reason the lifters are fitted to my sti version 4 heads they worked well in the car before i melted a piston they seemed to cope with ther high reving sti engine just fine and no tapping on start up??

not sure whats gone on but the car was rebuilt by previous owner so im guessing he has fitted these for some rerason..iv not seen the lifters my self only the cams while fitted so i carnt really coment but the cams are defo still the sti 4 jobs

im not looking to use the heads on my new builds im gonna sell on i think but just wondering why this would have been used it iuts baffled me...is there anywhere i can buy the underbuckets and shims to go with these heads from do you know

cheers for all your info your a good send mate

joz8968

iTrader: (13)

merlin's the Subaru 'head' massster!

Mattybr5@MB Developments

iTrader: (250)

the guys a legand and glad there are guys like mick around to help cheers again mate

STI_Baly

iTrader: (23)

Indeed....i cannot even scale how much Mick has helped me and continues to do so.....i wouldn't have half the knowledge about subarus including V3-4 heads if it wasn't for him...

Would be good if you could get some pictures on here Matty (as discussed) and some outer dimensions on these lifters. Just so we can see what has actually happened and if they are Phase1 (i'm assuming they are).

Mick surely if these are Phase 1 hydraulics would they have not been a very loose fit within the bucket seat of the v4 heads?

Mattybr5@MB Developments

iTrader: (250)

its all in hand as we spoke baly just need to get the heads back and il post pics and get to the bottom off this once and for all mate

merlin24

iTrader: (1)

Thanks for the kind words Guy's - not been on SN for a while due to personal problems but ......... off the top of me head, the Hydraulic lifters are approx.
29.95mm O/D and the STi solid lifters are 32.95mm - so yes Baly, bit of a **** in a sock job if they are Version 3~4 heads.

A quick check would be a feeler blade between the cam lobe base and lifter to see if you have clearance or not.


Mick