probloms in my 998 turbo engine build
Turbo Mini Forums

long time no see/spk all i hpe to be back on track with project mini lightweight

right i have probloms & looking for help!

gearbox is sweet

block/short engine all rotates as sweet as a nut!

head, fully recndition & built to a spec, & engine roates fine just slightly stiffer due to compression as you'd expect

when i fit the rockers the motor it wont rotate?

they take effort to tightendown on the head too! more than feels correct

any clues, the rest of the motor has gone together fine

should i fit/need shims under the rocker posts/feet

can anyone help me, or if in or near coventry come & have a look

Edited by clubminiflip on 11th Jan, 2010.

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Does your cam rotate ok and are all the followers free?

Edited by tomf on 11th Jan, 2010.

if the head has been skimmed LOADS then you'll need rocker pedestal spacers yes, I'm running these on my MED full race head. Without them When the rockers were tightened down the valves couldn't shut fully.

Also, are you using the right push rods? I was under the impression that 1275 rods were longer than 998 rods, although I could stand to be corrected on that.......

Mr. Prawn, the friendly Crustacean- slowly making steps towards forced induction.

I'd go with you have the wrong push rods. 1275 ones are 15mm longer iirc

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

push-rods came from "this" same 998 block :o??

head is a 12g295 with 28cc chambers, itshad a very minimal skim to make sure its flat, chambers were still 28cc after?

bill solis used rocker post shims in his mini dvd did'nt-sorry a lil off topic

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Make sure that all your followers are in place. On the 998 they can go up into the gallery above.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

all hunky dooory there paul, i've got all my engine/carb/intercooler/pipes etc ready to drop in my motor its just this problom to sort & i'm on the home straight i think, well apart from the getting it to run & run properly scenario LOL even got a new t2 turbo, arrrrrrhhhhhh

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Are any of the valve springs fully compressed?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

good question, i'll have to check that tomorrow!

the motor rotates about a 3/4 turn then will not turn

if i remove the rockers it rotates sweeter than sweet

Edited by clubminiflip on 11th Jan, 2010.

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Back off all the tappet adjusters, then try again.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

they are all the wY OUT

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

have you timed the cam correctly?

as above, is the timing gear standard, or have you changed it and timed in with a dial gauge/timing disc??

spec is as follows, 998 block bored to 1030cc

mg metro cam

belt brive

timed in with a dial gauge, adusted with offset woodruff key, its timed in spot on!

head is a stock 998 cooper 12g295, very mild porting, 28cc chambers, extremely minimal skim

block has been skimmed by the absolute least just to be sure its flat

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

more detailed stuff on my build is in my build thread

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=10121

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

somat aiunt right chaps, whats ya opinions?

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

i'll have some more info on my probs with my rockers? valves? whatever this probs seems to be i gotta wip th head off?

i've just been out & had a look at the rockers & they sit level & flat when the gaps are set correct

i cant rotate the crank as i've misplaced my socket that fits the crank bolt aarrrhhh fck sake! i cant find it & it cost me £31 for a proper 6-sided socket (
i'll have to clean the blummin grage now to try n find it! ball-ache

i'f i cantfigure it out i'll be putting the word out for soomeone or a few chaps with more engine building knowledge to pop round for tea n biccies to have a look n diagnoses session!

so close but yet so far to 998 turbo daily driver fun

cheers for your help john!!! kal

i'll give you ideas a go!!

Edited by clubminiflip on 22nd Jan, 2010.

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

are you 110% sure they are 998 pushrods and not the longer 1275 ones?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

yep they are defo 998 pushrods a they were out of this same a+ block! which was standard 998 a+ when i stripped it!

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

def the original 998 valves in the head?

if someone if the past has tinkered with the head, and lobbed some 1275 valves in there, then this might cause the issue

have the valves got one massive long collet groove, single thin groove or triple grooves?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

well thats what i have to check, new chap kal that has stuff for sale suggested the same as yourself joeybaby!!!

i'll wip the head iff & measure the length of the valves & what type collets they've got

whats the solution if i have 1275 valves

morespeed done my head! i asked for unleaded valve seats, head reconditioned & asked simon to do some mild porting/smoothing, i did'nt think i'd be at this point having to check a "known" shops work!!!

i'm in a bit of a mood about it as

1. i've trusted a professional outfit to do basicly an unleaded head

2.ni wish i had a lil more knowledge but then thats why i put my £ & trust in someone else in the know!

3. i cant think of a third reason as the first two are good enough D
dont get me wrong i'm not slagging simon off, he's a nice chap! but i think the pressure of buisness & cost cutting causes this greaf

if theres a differance in the length of 1275 valves to 998 ones then its left me in a shitty position has'nt it!
whats my solution if 1275 valves have been put in the head???

the head has been skimmed by a very very minor amount as the chambers are 27.8cc & with my compression calulations it make my compression around the 8.1.1 area so i can run a fair amount of boost

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

well they should have one long recess if they are original 12g295 valves

if they are non original valves in there, then its possible/likely simon will have chucked in 1275 ones as he will no doubt have loads kicking about

not necessarily a major set back though, but it will mean that rocker pillar spacers will be needed (and maybe some 1275 pushrods too???? vegard will know)

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

what a ball ache hey joey, i do have a solution but i want to use this head if i can as its actually the only unleaded smallbore head i have :o/

VEGARD WHERE ARE YOU????????????//
HELP ME DUDE my engine is green & half a-series (the head)
D

SKYLINES ARE LIKE CLITS, EVERY FLANGE SEEMS TO HAVE ONE: see this sticker on my silvia

the Search-section on this forum is blummin superb & simple to use, unlike some other forums, without the search-section & the help of this bunch of chaps on here i'll never be able to !!!Start the day with a 998cc turbo!!! :) i'm getting closer though!

Tom Fenton says: I have it all, make me an offer

Realy the length of the valve should not make any difference.

If you have set the clearances properly and the springs aren't binding, then the only possible explanation is that the exhaust valve is hitting the block. This can happen with high lift cams and a skimmed 12G295 as the valves do overlap the block deck, although I'm surprised that it can happen in this case.

Take the head off and measure the distance from the face of the exhaust valve to the face of the head. If this is less than the valve lift (0.320") minus the gasket thickness, then that's the problem.

EDIT: Check that you have a full thickness head i.e. minor skim only. The reason I say this is that when Morson did one of our heads a couple of years ago, we did not get back the head that we supplied.

Edited by Paul S on 23rd Jan, 2010.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."