9 replies to this topic

[Minimoke8394]

Morning chaps,

                         I popped a stage 1 kit on my 998 with HS4 last night (sounds mad with just the downpipe, ha) but to make it start I had to cover a threaded hole in the inlet....It can be seen here on this link. It's probably something really simple but I just couldn't see anything in the kit that should go there or anything existing on the old manifold on engine that would go in there. Any help would be lovely. 

 

Thanks very much, 

                              Chris. 

[gizmo1994]

Looks like the thread for the brake servo vacuum pipe. If you are non servo then you may have to just blank it off with a bolt and copper washer.

[Gremlin]

Its where the servo take off would go, but you obviously don't have a servo, so get a bolt, cut it down to say 3/4" long and tighten it in with a copper washer under the head, I think the thread is 5/8 UNF but get confirmation first

[Minimoke8394]

Aaaah, I see. Mine's an 82 Mayfair so no servo yeah. I suppose I want to make sure it just fills the hole rather than being proud on the inside? Would that affect the flow or anything? Cheers guys.

[Gremlin]

I seem to remember hearing about a group of guys and a Mini on a dyno and they were just fiddling to ge the best realuts, it was going well until they ground down the servo bolt as it was poking through and they lost abit of power, aparently it was creating slight amounts of turbulence which helped mix the fuel into the air. I'm not saying that it's going to make noticeable difference but.

I got rid of my servo and to blank off the hole I took the bolt out and welded up the hole/s and put it back in, people say don't you het a bit of an airleak?

[dklawson]

5/8 UNF is not a common bolt size so finding one may be difficult.  However, you could use an old temperature sending unit to plug the hole as it has the same thread.  If you are worried about the tip of the sender badly affecting the air flow, you can cut off the sender tip and if necessary... plug the inside of the gutted sender with epoxy.  I have no idea if cutting the tip off is necessary or beneficial.

[Jordie]

Pretty sure minispares sell a blanking plug for that.

[dklawson]

Pretty sure minispares sell a blanking plug for that.

 

So they do....  Mini Spares part ADP210.  Thanks Jordie.

[Minimoke8394]

Cheers for the info guys, lovely stuff. 

[Dusky]

I seem to remember hearing about a group of guys and a Mini on a dyno and they were just fiddling to ge the best realuts, it was going well until they ground down the servo bolt as it was poking through and they lost abit of power, aparently it was creating slight amounts of turbulence which helped mix the fuel into the air. I'm not saying that it's going to make noticeable difference but.

I got rid of my servo and to blank off the hole I took the bolt out and welded up the hole/s and put it back in, people say don't you het a bit of an airleak?

That's what I've been wondering about. My servo bolt doesn't protrude, but I used a blanking bolt and gorund it flush with the manifold.
Is this stupid to do or not? As in : would attaching the servo give any performance loss?. I'll probably have to connect it up for mot anyway.

 

Thanks for any input! ;)