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jsrail
'55 C300 331 Build ?'s


Well, I passed on the 270 Dodge Hemi, but I picked up a '55 C300 331 Hemi, adjustable rockers, original dual quad intake, etc.

I am wondering if there is a way to build a street blower set-up? Is there a way to build it so I can run around locally with a small blower, but then switch to my dual quad for long trips? Would the piston size and head work basically be the same, just different carb set-up for the dual quad vs. blower? (though I guess I could run dual carbs on the blower)

I know nothing of blowers, but always wanted to build a small blower set-up, not thinking of a race 392 blown Hemi, just something fun to have around town.

Can a system like this be set-up without having to change the engine internals? Any thoughts are appreciated. I don't really want to get rid of the original intake, but a Hemi also calls out for a blower!
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on: Tue 23 of Feb, 2010 [14:33 UTC] reads: 20004

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DaveBlakeman
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Re: '55 C300 331 Build ?'s
on: Thu 25 of Feb, 2010 [16:14 UTC] score: 0.00
I agree with Larry. Would'nt you rather just change pulleys than the whole set-up for a weekend trip. I personaly have never run a blower but from what Ive read people are driving blown cars to meets quite far from home these days. That and a blower motor internals are different than normally aspirated {as Larry states}. What your saying is doable but way labor intensive. Then you have to check for leaks etc bfore the trip. Just too much trouble. Build it like an airplane and forget about it.

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LarrySrader
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Re: '55 C300 331 Build ?'s
on: Tue 23 of Feb, 2010 [16:44 UTC] score: 0.00
Impractical yes, but doable? Certainly. You would want to stay in the 8.5-9.0 to 1 range on your compression with a small blower, which would still be a decent comp ratio without the blower. I would also use forged pistons. As for the cam, the main difference between a normal aspirated cam and a blower cam is that the normally aspirated cam typically has about a 108 degree LSA and a blower cam has around 114 degree LSA, meaning the blower cam has less valve overlap. The new Gen. III hemis all run cams with 112-114 LSA without blowers and make a lot of power, but without the oldschool lope you get with the typical hi-perf cam. I can't understand why there would be an issue with the pulleys, once everything is set up the pulleys wouldn't have to be messed with to switch back and forth. I would also have a complete carb setup for each configuration, because blower carbs are set up a lot different than normally aspirated carbs. You would also have to make timing changes between the two setups.

That being said, it would be a compromise with neither setup having optimum performance. Also, changing between the two induction systems would not be a 30 minute deal! If I were going to go to the expense of getting a blower setup for my hemi I would just leave it on all the time. It's my understanding that when properly set up, a blower motor can be quite reliable and get almost as good mileage as similarly equipped normally aspirated engine. Drive pulleys can be swapped to raise or lower the boost pressure for performance or better driveability a lot easier and cheaper than swapping the whole induction system, and you wouldn't have the compromises that you would with an engine built for both induction systems.

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George
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Re: '55 C300 331 Build ?'s
on: Tue 23 of Feb, 2010 [14:44 UTC] score: 0.00
> Well, I passed on the 270 Dodge Hemi, but I picked up a '55 C300 331 Hemi, adjustable rockers, original dual quad intake, etc.
>
> I am wondering if there is a way to build a street blower set-up? Is there a way to build it so I can run around locally with a small blower, but then switch to my dual quad for long trips? Would the piston size and head work basically be the same, just different carb set-up for the dual quad vs. blower? (though I guess I could run dual carbs on the blower)
>
> I know nothing of blowers, but always wanted to build a small blower set-up, not thinking of a race 392 blown Hemi, just something fun to have around town.
>
> Can a system like this be set-up without having to change the engine internals? Any thoughts are appreciated. I don't really want to get rid of the original intake, but a Hemi also calls out for a blower!
Blower cams are different than carb cams. There's also the pulley situation. Doc Fromader did a street blower 392 article in Street Rodder back in the 90s. Your plan is impracticle.

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LesButters
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Re: Re: '55 C300 331 Build ?'s
on: Wed 24 of Feb, 2010 [05:14 UTC] score: 0.00
I am > > Well, I passed on the 270 Dodge Hemi, but I picked up a '55 C300 331 Hemi, adjustable rockers, original dual quad intake, etc.
> >
> > I am wondering if there is a way to build a street blower set-up? Is there a way to build it so I can run around locally with a small blower, but then switch to my dual quad for long trips? Would the piston size and head work basically be the same, just different carb set-up for the dual quad vs. blower? (though I guess I could run dual carbs on the blower)
> >
> > I know nothing of blowers, but always wanted to build a small blower set-up, not thinking of a race 392 blown Hemi, just something fun to have around town.
> >
> > Can a system like this be set-up without having to change the engine internals? Any thoughts are appreciated. I don't really want to get rid of the original intake, but a Hemi also calls out for a blower!
> Blower cams are different than carb cams. There's also the pulley situation. Doc Fromader did a street blower 392 article in Street Rodder back in the 90s. Your plan is impracticle.


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