Author Topic: Lightweight M52 hydraulic lifters (Read 29870 times)

Boyracer · « **Reply #15 on:** March 21, 2007, 03:07:17 AM »

Crap! I did not know M52 had smaller diameter lifters then M50/M42. Anyone know if that is true?

M52 lifters weight the same as lighweight VW lifters that I have heard to fit M42 so I assumed they are identical. I guess I should order one M52 lifter from BMW to be measured.

Gunni · « **Reply #16 on:** March 21, 2007, 03:37:12 AM »

The measurements on the febi website show that they shouldn�t fit,
a 1mm diameter diffrence in the automotive world is alot.

do you know from wich VW the lifters are supposed to be from?

stuartgallafant · « **Reply #17 on:** March 21, 2007, 05:31:02 AM »

if you used solid lifters, what would set your valve clearances too? VC is extremely important, and getting it slightly wrong either way can have bad affects

i would be interested in using lightweight lifters, but not solid lifters. that sounds like grief.

there is company over here that do replacement bootom end bolts for the M42 for �60, and it safely allows the revs to be increased to 7500rpm. but i cant remember the name of the bloody company!!

Gunni · « **Reply #18 on:** March 21, 2007, 09:22:35 AM »

Euro S50 cam followers without shim are 46grams
now that would be an upgrade
I don�t have the specs on them and they wheren�t on the febi website.

stuartgallafant · « **Reply #19 on:** March 21, 2007, 12:43:01 PM »

tim_s was using VW lifters in his M42

stuartgallafant · « **Reply #20 on:** March 21, 2007, 12:44:41 PM »

ah, Automotive Race Products!! thats the company that do them bolts!! for about $100USD you can get all the bottom end bolts to raise the rev limiter, based on the bolts alone. maybe when coupled with the lifters, you can raise the rev limit even more?

Gunni · « **Reply #21 on:** March 21, 2007, 03:47:00 PM »

of course you need air feeding in at such high revs, no point in reving if there isn�t any air coming in.

Tim what lifters are you using?

silverblades181 · « **Reply #22 on:** March 21, 2007, 09:17:03 PM »

What about the oil pump? Can it make it to such high revs?

nickmpower · « **Reply #23 on:** March 21, 2007, 09:19:45 PM »

I dont think its nessary to upgrade the bolts

jpod999 · « **Reply #24 on:** March 21, 2007, 10:56:45 PM »

Wow, I have no idea what is being said in this thread. Lifters are the little pieces that hit the cams that move the valves up and down right? What's so good about having lighter or solid lifters?

AL GReeNeRy · « **Reply #25 on:** March 22, 2007, 12:57:04 AM »

Quote from: jpod999;21966

Wow, I have no idea what is being said in this thread. Lifters are the little pieces that hit the cams that move the valves up and down right? What's so good about having lighter or solid lifters?

its a little more complicated than that...

simply put, the cam lobe 'hits/lifts' the lifter or cam follower, which contacts the rocker arm. the rocker arm then redirects that force roughly 180 degrees and pushes down on the valves to open them. finally the valve spring works against the valve to close it again.

hydraulic lifters are good because valve clearance is a lot more lenient. since they are 'hydraulic' they have fluid (engine oil) flowing through them. they allow for compensation due to engine temperature (engine components continuously expand and contract). hydraulic lifters pretty much always maintain contact with the other valvetrain parts.

solid lifters are a lot more durable than hydraulics (less moving parts is always a plus). however, the valve clearance must be maintained for proper engine operation, again this is because of the expansion and contraction of engine parts..

most people switch to solid lifters because they can simply take a more crucial beating than your average hydraulic lifter

again, this is just a basic run down of the lifters and the cylinder head.. hydraulic lifters actually have more to them

anybody know if german cars ever used roller lifters? those might work better than solid lifters...

stuartgallafant · « **Reply #26 on:** March 22, 2007, 04:10:50 AM »

Quote from: nickmpower;21959

I dont think its nessary to upgrade the bolts

someone said earlier in this thread, that you can up the revs by changing the lifters, but will the bottom end take it? im just saying that there is a company that sells stronger bolts for the bottom end, so you can achieve higher revs

silverblades181 · « **Reply #27 on:** March 23, 2007, 03:04:33 PM »

Quote from: stuartgallafant;21974

someone said earlier in this thread, that you can up the revs by changing the lifters, but will the bottom end take it? im just saying that there is a company that sells stronger bolts for the bottom end, so you can achieve higher revs

It's not the bolts that can't take the higher revs it's the oil pump, bearings and crank. Mostly because the crank will vibrate at such high revs because of inertia. Puting on stronger bolts is not going to make your engine safer at high revs...well...I might be wrong, but I highly doubt it.

As for lifters, the M42 doesn't have rocker arms, it's directly on the cam. Having lighter parts will reduce the overall weight of the parts in movement, reducing inertia and permitting higher revs without the engine self destructing.

sheepdog · « **Reply #28 on:** March 24, 2007, 04:08:40 PM »

No,. the stock bottom end will not take 7800. At least not for anything more than a couple times. The bearings and oiling system cannot take it.

Read up the Metric Mechabnic M42 to see what they do to make sure the engine will live at those rpm's. Remember, M42 guys live in the high rpm range. So the motor would need to be able to stand it for a bit of time, not just once or twice on accident.

nickmpower · « **Reply #29 on:** March 24, 2007, 04:13:06 PM »

if using the m47 crank you dont need their 360 oiling bearings. The m47 crank also comes with a 360 degree thrust bearing