dazrsturbo

iTrader: (3)

hello all, im having trouble with my newly built rst. its an mfi engine which has been fully rebuilt. crank re ground all new shells, rings ect. new waterpump. oil pump belts, dizzy ect. now the problem im having is that when the car is underload it makes so much noise.. like a very loud tappping, iv just put another gearbox on thinking it could be that but has made no difference. it has a brand new clutch and skimmed fly wheel too. could a new cam and lifters be the answer or does anyone else have any idea what else could be making the noise. its only when driving along when revs get high that it does it not really noticable on tick over.

richbogle

That is strange made. Who dun engine work on car?

frsjon

fully rebuilt but not the cam? if a new cams died already thats not too good. what grade oil are you using ?

simonmcf

iTrader: (1)

Throw it out there, engine or box mounts?

Chopshop85

iTrader: (4)

How many miles has the engine done?
New cam and lifters will be very noisy for the first 20+ minutes. Although that should be run in before being driven.
Maybe oil pressure/pump starving the head at high revs?

landaqmabba

could it be valves not seated properly? or maybe something loose was left in the valve cover or it the sump and at high revvs it rattles against something else??? happened to me when i snapped the timing belt on my old fiesta i forgot a nut in the valve cover and at high revvs it made a lot of noise.......... also could it be the fuel mixture isn t correct and it rattles cause of that? don t know just throwing ideas around......

dazrsturbo

iTrader: (3)

cam was not replaced ( wish i had now!) tryed two heads with two diff cams in and still same noise. plenty of oil getting to the top.

dazrsturbo

iTrader: (3)

have also changed oil twice and new mains and big ends, belt tensioner is new too.

milesy23rst

iTrader: (16)

Change cam & followers mate as everything else in your engine build is new

landaqmabba

might sound stupid but, if he tried different heads with diffrent cams i would imagine the problem being in the block not the head ????

Karlos G

iTrader: (4)

I'm thinking oil starvation at high RPM, I noticed on my CVH that at sustained high RPM my oil pressure gauge surged if I was below the maximum on the dip stick... Doesnt drain back down fast enough... Then I spun a big end bearing! lol
Don't do this, as you said you've tried two heads/cams so that points to the bottom end sadly... If you can hear it knocking then you may have ruined your new shells/crank.
It takes no time to whip the sump off and check your big ends, I would do this if keeping your oil at maximum doesnt help.
What oil pressure are you seeing at idle and at 3000rpm after a 30 mins drive? Oil should be fully synth 10/50 if you didnt know.

milesy23rst

iTrader: (16)

Who's to say the cams in the other heads aint fucked too just a thought and his build is new so why as you say karlos g would his bottom end be gone and his shells & crank be knackered?? unless maybe the oil pump has failed?

frsjon

just curious to what grade oil your using? if the right grade id check the big end bolts havent come loose..(but from past experience that would be noisy all the time )

dazrsturbo

iTrader: (3)

i put all new shells in when i redone engine. but have sinced changed the mains and big ends and new oil. 10 40 semi synth

dazrsturbo

iTrader: (3)

the oil pump was also new. a brand new auto pumps one iirc. the car has covered about 10 miles! its too noisey to drive just going through the gears let alone givin it some.

Rob_DOHC

iTrader: (4)

Could you be hearing severe detonation perhaps? Checked your ignition timing?

Rob,

Karlos G

iTrader: (4)

Cams/lifters very very rarely tap loudly and if they do it's down to low oil pressure... Even when I have had the lifter bases break up and fall apart they still didnt tap/knock because they are hydraulic and take up the slack.
Have you meassured the crank before fitting any of those shells? What was the condition of the ones you changed again?
What oil pressure are you seeing at idle and at 3000rpm after a 30 mins drive?

darrenb16two

That was my first thought aswell

dazrsturbo

iTrader: (3)

dizzy is set with the bolts half way. which way would i need to turn it to make it better? towards the bulkhead or away. timing belt is spot on tdc. and the cam is a piper 285t2.

dazrsturbo

iTrader: (3)

crank was reground and bearing supplied to suit. i dont have an oil pressure gauge fitted, the oil pressure sensor is new too btw.

stevo123

+1 for ignition timing (not to be confused with cam timing). Turn away from bulkhead (as in undoing a bolt ie to the left if looking at the cap). Just a few mm and try it again. However, if it was so far advanced you would probably be having starting issues and it would seem like the starter is not strong enough to turn the motor.

Karlos G

iTrader: (4)

You need to check it is at 12BTDC with a timing light, unplug the vacuum hose to the ECU and block it when you do it.
This is for stock boost though, if you are running more then set it at 8DBTDC to be safe!
IMO if it was detonating bad enough to sound like a knocking engine you would have cracked a ring land by now, but well worth checking all the same.
Ok... Could you post a video of it knocking? Get somone to rev it a little whilst you take it, might make it easier to diagnose!


Does it sound anything like this?

the_frozen_one

iTrader: (1)

Exhaust manifold gasket

Karlos G

iTrader: (4)

Good call! Sounds very much like tapping.

the_frozen_one

iTrader: (1)

Starts off just being under load too, eventually will burn through to the point where its ticking all the time.

What manifold/turbo set up is in use? Please don't say autospecialists

dazrsturbo

iTrader: (3)

it sounds abit like that but deffo not that bad thats very bad! thats the sort of noise it makes on load but not that bad. do you mean set the bottom pully at 12 degrees btdc or the cam pully??

dazrsturbo

iTrader: (3)

exhaust gasket is new and no signs of leaks. and its a standard set up with the turbo

Chopshop85

iTrader: (4)

Gonna throw it out there..... you sure its not just good old CVH tappyrattles

dazrsturbo

iTrader: (3)

someone else has mentioned little end bearings?? possible?

dazrsturbo

iTrader: (3)

ok so i adjusted the ignition timing and it now ticks over at 1000. which is way better that the almost 3k i was getting before. cam sounds very tappy so think im gunna change this and go from there. anyone have any ideas?

simonmcf

iTrader: (1)

replace cam and I reckon you will be spot on.

CasperR

Glad my knocking engine is to some use lol
That's my old engine, only just replaced it last weekend. It was the bottom end, haven't taken it apart yet, but I was told ring lands. I'll take it apart tomorrow.

fezzy240bhp

am having the exact same problem with mine at the moment only does it under load it sounds like engines gona fall out,.......read my post... if u find out a solution please tell... if its like mine its not engine. i suspected clutch release bearing but who knows got to just have a stab at things i guess

dazrsturbo

iTrader: (3)

yes mine makes the noise only when driving. not just at high revs but at any revs going through the gears. my clutch release bearing is brand new as is the clutch. i noticed last night after i adjusted the ignition timing i took the car up the road and when i got it bk in the garage it was very hot!! water was boiling. whats happend there??

fezzy240bhp

any way the engine wouldnt last two mins if it was a big end bearing

fezzy240bhp

might be water pump then because i am loosing water too and head gasket is fine might be both are problems dunno tho i wud of thought it wud of done it all time but maybe only does it as its trying to feed more water through i dunno its pissing me off i bought a new engine mount and made it worse lol

dazrsturbo

iTrader: (3)

the water pump is brand new on my engine mate so dunno if that would be whats making the noise. im gunna flush my system out. iv just recently changed my mains and big end bearings and it made no difference.

Karlos G

iTrader: (4)

You've retarded the timing too much, that's why your hot.
Ring lands do not knock, as a rule you will just be down on compression on that cylinder and so be running on three.
An engine will run for ages with a knocking big end... It will just be really noisy! Lol

fezzy240bhp

Well fuck knows seeing as tho u changed everything then ! What about driveshafts ? I Duno pal am in same predicament

B16CVH

Not the piston hitting the valves maybe if the heads have been heavily skimmed/block heavily decked?