Fitting cams - issue

[Donny_Dog]

Its not a clio, so apologies. But wonder if this problem is universal.
I am not a mechanic and never done this before.

We've just put some 708 Cat cams in a track car. But the inlet cam wouldn't turn afterwards.
Turns out that the cams are scoring the casting and then getting to a point where they just physically cannot move past the casting when rotated. The journals seem fine, the lobe edges are the issue. Its as if they are too big for the casting, yet they are mass produced and I cannot find another issue similar on the forums.

The bearings seem to be fine, seals are fine, it seats in the carrier fine. Just at a certain point and 2 lobes in particular, it catches, scores and then gets stuck.

Is this common?

Ended up getting the dremel out on the casting!

 

[MicKPM]

Some aftermarket cams do require some modification to the cylinder head casting to allow them room to rotate... I stress *some* and it tends to e the slightly wilder profiles.

Check the manufacturers website chap.

Mick

 

[Donny_Dog]

Some aftermarket cams do require some modification to the cylinder head casting to allow them room to rotate... I stress *some* and it tends to e the slightly wilder profiles.

Check the manufacturers website chap.

Mick

Thanks Mick.
Checked the site and it said the only thing to worry about was stock timing would potentially cause an idling issue and to r****d the inlet by up to 2 degrees - fook all about them not fitting. They're massed produced too - stuck in a million saxo's/106's etc - no one seems to have documented the same problem.

Ah well, will find out tomorrow if they're much good.

 

[mitch1503]

i remember reading somewhere about some cams catching on the cylinder head when i had my VTS and was thinking of caming it

 

[leeds_182]

I've read about this before when I was looking for the Rallye. I don't think it's that uncommon....

 

[Donny_Dog]

Good to know.

 

[aterro]

I've never heard anything like this before.
I've fitted numerous sets of 708s,ph3s,285s and never had a problem.

You got the right can in each ladder?

 

[Donny_Dog]

I've never heard anything like this before.
I've fitted numerous sets of 708s,ph3s,285s and never had a problem.

You got the right can in each ladder?

Well, they are marked in and ex. The exhaust profile or tip of the lobe looks more pointy than the inlet one, which in my opinion seems sound.

Even so, the height of the lobes don't appear to be at fault, it's the width of the casting near the journals. It looks as if the lobes are too wide (in places) and thus scraping the casting to fit.

 

[Donny_Dog]

Doesn't look like it makes much difference anyway.

http://106owners.co.uk/forums/showthread.php?224409-shocker-caat-cams-are-in-the-wrong-way-round

 

[Donny_Dog]

http://www.saxperience.com/forum/archive/index.php/t-394627.html

Lol. The guy who I bought them off has posted in here with the same issue as me!

Doh.

Sorted anyway.

 

[KenH]

Is it going to be ready for Sunday? Sadly the Lotus won't be - looks like HGF. So we will be there in the Clio and maybe the MX5 as well.

 

[JackJack]

Sorted anyway.

How out of interest?

 

[Donny_Dog]

Is it going to be ready for Sunday? Sadly the Lotus won't be - looks like HGF. So we will be there in the Clio and maybe the MX5 as well.

Yes ken, she fired up last night!
Majorly excited for Sunday.

 

[Donny_Dog]

How out of interest?

Using a dremel. Grinding away the casting.

 

[Chip-mk1]

Not uncommon, I mapped a 1600 fiesta on bodies with some very lairy cams and MWM had to machine the head when they installed the cams in that as well.

 

[len_beach]

Have you fitted your headlight supercharger?