Split vacuum pipe... what would it do.

General Topics for configuring, operating and tuning the Megajolt. Also see the <a href="http://www.autosportlabs.net/MJLJ_V4_Operation_Guide">Operation Guide</a>

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Mini1293
Posts: 51
Joined: Sat Jan 31, 2009 11:08 am
Location: Sussex

Split vacuum pipe... what would it do.

Post by Mini1293 »

Hey guys.

Im currently doing a few changes to my Mini which has involved taking the engine out etc.

While stripping the car down, i noticed that the pipe iv run from the inlet manifold to the MJLJR was split a few inches in.
Iv just taken it out, blocked one end and blew down the other, and it leaks air...

So what would this have done to the operation of the engine / ECU whilst in was in use?


cheers.

brentp
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Post by brentp »

If it leaks a huge amount then the Megajolt will act as if your engine is seeing more 'load' than it really is. Remember - atmosphere pressure = Wide Open Throttle. So the Megajolt might've been acting as if you are driving around with the pedal floored constantly.

As far as damage to your engine and so on- it wouldn't be risky in terms of damage- your idle and cruise performance might've been degraded, at worst.
Brent Picasso
CEO and Founder, Autosport Labs
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Mini1293
Posts: 51
Joined: Sat Jan 31, 2009 11:08 am
Location: Sussex

Post by Mini1293 »

Thanks for the speedy reply!

Thats makes sense to me. Maybe this was partially thge reason to my cold start / idle problems.

I didn't put this down the the engine problems, which is now being re-built.

The problems on cold start, it just wouldn't idle on choke, i had to sit in it keeping it going until it warmed up. We've put this down to carb settings, but you think it could also be this spilt pipe?


cheers

brentp
Site Admin
Posts: 6282
Joined: Wed Jan 24, 2007 6:36 am

Post by brentp »

Your ignition advance at idle would definitely affect how it runs, esp. at cold start. When you get your engine back together see if it makes a significant difference and let us know!
Brent Picasso
CEO and Founder, Autosport Labs
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Mini1293
Posts: 51
Joined: Sat Jan 31, 2009 11:08 am
Location: Sussex

Post by Mini1293 »

Thats great info to know. I wont change anything on the carb until its back on, put it back together how it as but just with a new vac pipe and will let you know!



cheers

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