R31 Rb30E - Need Help Asap

[SPINR31]

Ok so im having some issues with me new engine.

got a reco cammed rb30 put in, needed to use a few parts off my old engine.

- Lifters

- Whole Intake System

- Whole Fuel System (rails, plugs injectors etc)

- flywheel.

- wiring, ecu, trans, clutch etc were left intact while engine was replaced (not replaced)

1st Issue: this engine knocks exactly like my last one although not quite as bad (happens anywhere between 1500 and 3200 approx rpm), this engine has a mild stage 2 cam in it.......it is currently usuing the lifters out of my other standard cam engine...same problem, i am almost adiment this issue is lifters but i need advice on what lifters to get because i dont know the cam specs.

Youtube link:

www.youtube.com/watch?v=DvmlchfBaE0

2ND ISSUE; When the car gets to normal operating temps (anything over a quarter on the gauge) it randomly starts misifring as if the engine cuts out completely for a minute amount of a second......doesn't do it when its cold, only when it is getting warm, few people have told me Crank Angle Sensor but i'm not sure...

Cheers in advance guys.

Edited October 27, 2011 by SPINR31

[fat_rb25]

if it was the lifters it wouldnt be making a knocking noise just a tapping noise, have u checked ur valve clearence?

who rebuildt your motor? did they change big and main bearings?

[SPINR31]

  On 30/10/2011 at 2:00 AM, fat_rb25 said:

if it was the lifters it wouldnt be making a knocking noise just a tapping noise, have u checked ur valve clearence?

who rebuildt your motor? did they change big and main bearings?

it was a mate that rebuilt it, all the bearings were NOT changed at all, he im not sure if he checked valve clearance

[niZmO_Man]

2nd issue - Crank Angle Sensor

[StevenCJR31]

i had a higher than standard lift/duration cam fitted to my R31 RB30E head, . . .not 100% sure as to why BUT the lifter cradles HAD to be machined to suit that cam, if you havnt had that done then that could be your problem

[fat_rb25]

the thing is the motor was knocking before you rebuilt it, and now its still knocking and you didnt change ur bearings. so i reckon could be a bottom end knocking

i dont know if you can change the bearings while the motor is still in, if you have enough room to take the sump out and change the bearings

[SPINR31]

  On 01/11/2011 at 10:44 AM, fat_rb25 said:

the thing is the motor was knocking before you rebuilt it, and now its still knocking and you didnt change ur bearings. so i reckon could be a bottom end knocking

i dont know if you can change the bearings while the motor is still in, if you have enough room to take the sump out and change the bearings

nah this is a different motor to my old one that was knocking, it was knocking the same though with the new motor, which leads me to believe that it is the lifters, or rockers as they are the only bits from my old engine.

  On 31/10/2011 at 11:19 PM, StevenCJR31 said:

i had a higher than standard lift/duration cam fitted to my R31 RB30E head, . . .not 100% sure as to why BUT the lifter cradles HAD to be machined to suit that cam, if you havnt had that done then that could be your problem

yer i have heard that to but i dont know the specs for the cam so i dont know how much needs to be machines off the lifter blocks

[SPINR31]

  On 31/10/2011 at 10:25 PM, niZmO_Man said:

2nd issue - Crank Angle Sensor

yer cheers, i thought it may have been, do you know if vl and r31 CAS are the same? i read somewhere that the vl use hitachi ones and the r31 use mitsubishi? but does it matter

[BOOZTJUNKEY]

  On 02/11/2011 at 1:14 AM, SPINR31 said:

yer cheers, i thought it may have been, do you know if vl and r31 CAS are the same? i read somewhere that the vl use hitachi ones and the r31 use mitsubishi? but does it matter

General rule of thumb is ...

If it plugs in it "should work" but either way they should be the same

[StevenCJR31]

  On 02/11/2011 at 1:09 AM, SPINR31 said:

nah this is a different motor to my old one that was knocking, it was knocking the same though with the new motor, which leads me to believe that it is the lifters, or rockers as they are the only bits from my old engine.

yer i have heard that to but i dont know the specs for the cam so i dont know how much needs to be machines off the lifter blocks

pull the cam out and take it to a cam grinder and they will have the means of measuring the lift and duration of your cam, from there you can work out if/how much you need to machine off the lifter cradle

be aware that using old lifters is fraught with problems, if they arent matched up to the lobe that they were running on before then they can be noisy, always use new lifters with a new cam and buy good quality lifters, i made the mistake of getting cheap ones and the effing things didnt fit nicely in the lifter cradle

[SPINR31]

  On 02/11/2011 at 11:04 PM, StevenCJR31 said:

pull the cam out and take it to a cam grinder and they will have the means of measuring the lift and duration of your cam, from there you can work out if/how much you need to machine off the lifter cradle

be aware that using old lifters is fraught with problems, if they arent matched up to the lobe that they were running on before then they can be noisy, always use new lifters with a new cam and buy good quality lifters, i made the mistake of getting cheap ones and the effing things didnt fit nicely in the lifter cradle

yer i was going to take it to wade cams in melbourne, having said that who does lifter cradle machining, closest to bendigo