Tuning Which Top Bob?

[pat352]

Ok, so I've got a plastic one from an 899cc Sei/Cinq but Ive also got the materials to make one with a 76mm inlet from aluminium.

However, I was thinking this morning, would there be any significant benefit of the 76mm inlet over the 45mm of the plastic inlet? Bearing in mind that any airflow will be restricted to 40mm at the TB anyway, so what difference if its restricted to 45mm at the bob?

So which should I use?

I am, at some point, going to go the dreaded 'T' route, so would a metal bob be better suited for that?

Cheers,

Pat

 

[Eklipze3k]

@rallycinq used a "double-bob" setup, and I'm fairly sure he wasn't even using a 40mm TB, so there will be benefits to increasing the intake size I'm sure., I just don't know what they are

Found it - https://www.fiatforum.com/cinquecento-seicento/86618-big-bob.html?p=945040

 

[Razman]

http://www.dexcraft.com/high-perfor...uecento-seicento-sport-air-induction-kit.html

By far and away the best design I've seen for a bob. One nice smooth curve for the pipe too

 

[pat352]

Found it - https://www.fiatforum.com/cinquecento-seicento/86618-big-bob.html?p=945040

Thanks, some interesting stuff in there. Why the heck couldn't I find it when I searched though? :bang:

http://www.dexcraft.com/high-perfor...uecento-seicento-sport-air-induction-kit.html

By far and away the best design I've seen for a bob. One nice smooth curve for the pipe too

Yeah, looks like a really good bit of kit and one that I may buy in the future. But not within my current budget.

Aluminum and my time are cheap like the budgie lol

 

[fingers99]

Mallet, block of wood, heat, TIG.

Remember, Aluminium was the carbon fibre of the 1950s!

 

[fingers99]

Google: hammer forming aluminum

Incidentally, wonder if anyone has married a Dexcraft bob to a GSR induction kit?

 

[jatkinson]

my bob (made by Brooky

not the best pic

 

[Razman]

Google: hammer forming aluminum

Incidentally, wonder if anyone has married a Dexcraft bob to a GSR induction kit?

The Dexcraft bob looks quite long and moves quite far to the right, not sure if the GSR would fit? Also, how big is the diameter of the GSR at the bob end? The Dexcraft one has a much larger diameter than the 899 bob.

 

[pat352]

my bob (made by Brooky

not the best pic

That's what I'm aiming for. Looks like a top job

 

[fingers99]

my bob (made by Brooky

not the best pic

Anything to save selling you the Novitec one!

 

[blu73]

bob from palio would be bolt on - hard to find now though as no longer available new and never many palio's in UK either.. But part number is 46425241

and they look like this, you just bolt it on the other way in a cento...

 

[jatkinson]

Ill dig a picture out of my one i made out of a merea ( i think ) one