| Author |
Message |
Mike Charness (Mcharness)
Junior Member
Username: Mcharness
Post Number: 84
Registered: 8-2002
| | Posted on Wednesday, October 09, 2002 - 12:31 pm: | |
I tightened it until it "felt" right and the springs were clearly under compression, though not necessarily fully compressed -- you still want some "flex" |
Kurt Kjelgaard (Kurtk328)
Junior Member
Username: Kurtk328
Post Number: 145
Registered: 3-2001
| | Posted on Wednesday, October 09, 2002 - 3:40 am: | |
Anybody? |
Kurt Kjelgaard (Kurtk328)
Junior Member
Username: Kurtk328
Post Number: 143
Registered: 3-2001
| | Posted on Thursday, October 03, 2002 - 3:02 am: | |
The bolts are straight from the Ferrari dealer,
corresponding to the Parts manual and identical to the old ones fitted from the factory.
There is no doubt that they are the correct ones.
Still need advice on how much space should be between spacer and flange when fitted.
The 308QV seems to be similar to the 328.
All of you that have fitted testpipes - how did you tighten up the nuts? |
mike 308 (Concorde)
New member
Username: Concorde
Post Number: 37
Registered: 8-2002
| | Posted on Wednesday, October 02, 2002 - 7:57 pm: | |
My 308/QV has bolts just like you describe on your 328. |
Bill Sebestyen (Bill308)
Member
Username: Bill308
Post Number: 363
Registered: 5-2001
| | Posted on Wednesday, October 02, 2002 - 12:15 pm: | |
Kurt,
Yup, I talking about header pipes to cats, cats to the turning tube on the aft bank, and to the muffler. The shoulder studs ensure correct compression. The springs add compliance to the system to allow some movement of the engine, without overly stressing the exhaust system. When I first got my car, it was fitted with a hard bolted, ANSA, exhaust system. I retrofitted a good used US, OEM, cat system and luckly got all the studs, springs, and hardware with the replacement system. It's possible that the 328 uses bolts, but I'd check the parts catalog to confirm. The problem with bolts is that they will wiggle and wear the flange holes unless bolted tight. This defeats the purpose of the springs. |
Kurt Kjelgaard (Kurtk328)
Junior Member
Username: Kurtk328
Post Number: 142
Registered: 3-2001
| | Posted on Wednesday, October 02, 2002 - 11:54 am: | |
Thats is different from the 328 bolts.
They are normal, long bolts and if you tighten up the nut, the spacer will be squeezed between the bolt head and the flange and in effect just take up the extra length of the bolt. The spring around the spacer will then have no effect at all.
It seems that only the cat systems have this way of fitting.
The euro (non-cat) cars have normal short bolts with washers and nuts (no spacers, no springs).
Maybe the cat system connections need some way to expand, hence the spring? or?
Just to make sure - I'm talking about the connections downstream of the manifolds, not the manifold-to-cylinder head bolts |
Bill Sebestyen (Bill308)
Member
Username: Bill308
Post Number: 361
Registered: 5-2001
| | Posted on Wednesday, October 02, 2002 - 7:27 am: | |
Kurt,
The OEM bolts on my 308 are actually studs with machined shoulders. When fully tightened, the outside washers seat on the shoulders resulting in a controlled compression of the spring. |
Kurt Kjelgaard (Kurtk328)
Junior Member
Username: Kurtk328
Post Number: 140
Registered: 3-2001
| | Posted on Wednesday, October 02, 2002 - 6:02 am: | |
The exhaust pipes on cat cars are bolted together with long bolts. On these bolts are spacers and
springs.
Anybody have an idea about how much space should be between the spacer and the exhaust flanges in order for the spring to work properly?
Nothing in the WSM.
Thanks. |