2276 questions

[Diederick/DVK]

well that's how gassers run, right?
so, i'd guess it's limited to a minute or 2-3?

[richie]

guys,
a question for the near future...
i want to break in my engine without cooling tins to easily check for oils leaks and so on..
i want to do some test runs on the street, so how long do you think i can drive without cooling ?
i have an oil temp gauge , but i m worrying about the heads.
thanks!

Without any tin?  I would do 5 mins,then let it cool off,then 5 more cool off,till the cam is bedded in,if you wanted to drive it without any tinwork,proberly 7/8 mins without much load on it

But you realise you have to remove the heads to put the under cylinder tins back in unless you have 2 piece push rod tubes?

cheers richie

[Peter]

hey guys,
thanks to the help of donder;
i torqued the gland nut to 400 pounds and measured 0.12 mm endplay one thing less to do

[DWL_Puavo]

Webcam recommends that the cam should be broke in the "quite-normal" 20mins for first time and for a bit over 2000rpm. I think that can't be done without cooling available. It isn't that a big job to install cooling tins and fan housing, and we've found that it's easiest to do the first break-in in an assembly bench (picture of our bench, had to overdo it as usual) - then the oil leaks can be easily contained (we had warped oil filter mounting before so we had to take small precautions as shows in picture above).

On that engine we have 2275cc, webcam 86c with bugpack 1.25 rollers, CR 9.9 (0 deck and 1.66mm copper shims), msd 6al, 45 dells and hand-ported 044:s with 44 / 37.5 valves (54cc). It starts to pull from 1300rpm and kicks nicely at 4000rpm. It has been driven pedal floored on 6h endurances and works out wonderfully!

And onto the another questions on this thread as our engine is quite similar:
- GB equalizer was really a tight fit onto crankshaft and to the case
- CB 82mm crankshaft cleared the camshaft nicely without any work (with cb 5.5" race rods)
- berg lash caps were really tight
- we broke-in the cam with loose springs only, and after first break-in, we installed berg doubles and checked the head bolt torques

If sometime our engine is to be used in shorter races than endurance, I'll install 1.22mm coppers (CR -> 10.5) and 1.5:1 rockers, should be good for few ponies more!

[Peter]

thanks dude!
i got my pushrods cut today...
it might be finished earlier than i thought

[airstuff]

Great to hear you are  finalizing your motor build.Put some more pics if you can.

Cheers,

Zvonimir

[Peter]

i am tearing it down for the final time and saw that the cam bearings are polished ,
could this be due to the mockup: setting geometry ...?
i did it with the duals installed, so maybe its from the springs pushing the lifters pushing the cam and no oil pressure?
should i worry or not?

[Jim Ratto]

i am tearing it down for the final time and saw that the cam bearings are polished ,
could this be due to the mockup: setting geometry ...?
i did it with the duals installed, so maybe its from the springs pushing the lifters pushing the cam and no oil pressure?
should i worry or not?

Hi ruff
That's from running the cam dry on the bearings, against valve spring pressure.
I have a "spare" set of old cam bearings I use for "mockup" while I check lift and geometry and all that.
You can take 0000 steel wool and polish the bearings and that should make them fine.
Or buy some new ones and you'll have a spare set for mocking up next time.
I use steel wool 0000 to polish thrust surfaces of cam bearings after getting end clearance of .002" set and grooving for extra oiling.

[Peter]

thanks for the answer(s) jim :)i hope  i can put it together this weekend
figers crossed

[Jim Ratto]

thanks for the answer(s) jim :)i hope  i can put it together this weekend
figers crossed

good luck and let us know if you need any help

[Peter]

hey guys , now everything is taken apart,
would it be good if i cut the groove in my udos a la berg lifters?

what oil piston goes where? i ve got a plain one and the one with the groove..

Thank you!

[Peter]

some pics...
putting in the lifters..
and aligning the no2 main bearing

[Peter]

and some other:
plastiguaged the cam again to double check: 0.001-0.002" clearance
the second pic is where i m at now

[ian c]

hey ruff !!
hows it goin .

i see you started mock-up and clearance checking on march 18th .......

tommorow , its august 18th !!   



i hope the saying is true that what you get out of it is relative to how much you put into it !! (should be good for 200k miles  )

i bet you cant wait to fire it up 

(at this point i await sheep posting to have a dig at jim  )

[Peter]

dude what can i say, i am slow :d
waiting for parts and jobs to be finished took a lot of time too
and i want to do most of it myself
but i m gettin there ...one day
i m almost ready to join the casehalves

[ian c]

lol

precision engineering takes time !!

though its better to say this to the boss when you DONT have the smell of coffee and cigerettes coming from your mouth

i'm sure it'll be worth the wait buddy .

[Peter]

case is closed 

[Peter]

and yeah i know..
it looks messy

[Peter]

some progress has been made...

before:

[Peter]

and after...

[Peter]

couldnt resist to do some more useless work

[lowfastbus]

looking good!!

[Peter]

thanks dude
we re gonna race soon

[ian c]

[67worshipper]

looks like you,ve just shot ur load ian

[ian c]

lmao

[Peter]

watch out for your keyboard!

[wolfswest]

looking good Peter,

Will your car be @ DDD ?

Dem

[Peter]

I hope so!
i want to have it on the dyno as well

[airstuff]

hello Ruff,

how far are you from firing the engine

Cheers!