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Old 11-19-2007, 09:35 PM
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Supercharger?

Hi there,

I'm building up a new Bedford (English) Truck.. 383 engine, reasonably stock:

Dart Hi-Flow cylinder heads
ARP Head Kit. Fully Balanced,
Edelbrock intake, Eagle Conrods
600 HP rated,Eagle Crankshaft, Romac Balancer
Rollmaster Timing Chain & Gear Set fitted.
Torque Grind Camshaft.
9.7:1 Compression Speed pro Pistons

The truck will have a kerb weight of about 4690lbs and a Gross Vehicle Mass of about 13,000lbs.. but its unlikely to ever be carrying a load.. The transmission is a TH400.. and the differential ratio is 5.43:1.. it'll be running 95 octane petrol (err.. gas)..

The current carburettor is a 4 barrel Rochester Quadrajet..

Local laws make a forward facing intake that protrudes above the bonnet difficult (but not impossible). Rear facing intakes are acceptable provided certain visibility criteria are met.. I have about 220mm of space between the bottom of the current air cleaner and the bonnet..

What would I get out of a supercharger.. and what supercharger would best suit this application?

Any thoughts?

With thanks,

Dunc.

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Old 11-19-2007, 09:41 PM
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Here's the local design rules regarding bonnet scoops:

Bonnet Scoops

The fitting of a rearward opening bonnet scoop is permitted without specific approval or inspection providing that the following criteria can be met.

a. Bonnet scoops manufactured from a plastic or fibreglass material may be fitted, providing that the hole in the original bonnet does not substantially reduce the strength or impact resistance of the bonnet and no rigid component, such as an air cleaner or carburettor protrudes beyond the original bonnet profile.

b. Holes may be cut in the bonnet and the protrusion of an air cleaner or carburettor above the bonnet line but below the bonnet scoop providing that the bonnet scoop or raised bonnet section is manufactured from equivalent gauge mild steel compared with the original bonnet.

c. If any bonnet reinforcing braces are cut or modified the design of the modified bonnet must be of equal strength to the original bonnet and any sharp edges created must be suitably treated.

d. All edges and corners shall have a radius of not less than 5 millimetres and of general design and
construction so as to reduce to a minimum the risk of bodily injury to any person.

e. In addition, any bonnet scoop is unacceptable if it restricts the field of view of the driver under normal operating conditions. The field of view requirements are determined as follows:

With the drivers seat in the rearmost position, it shall be possible to see, unobstructed for the full width of the vehicle, a line drawn on the roadway 11 metres ahead of the "driver's eye position" when looking over the bonnet scoop. For the purpose of this requirement the "driver's eye position" shall lie at the bottom of the of the 95th percentile eye ellipse (reference ADR 15/01
clause 15.1.5.1).

Alternatively the "driver's eye position" can be taken as a point 750 millimetres above and 270 millimetres forward of the junction of the seat cushion and seat squab with the seat in the lowest and rearmost position.

The fitting of forward opening bonnet scoops, which have the potential to increase injuries to pedestrians in collisions, for example forward opening "letter box" style, are not acceptable

Cheers, Dunc.
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Old 11-19-2007, 10:20 PM
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Air

Air is king in power but it (supercharging) may affect longevity. That said you may be looking for a Paxton or some such that is mounted like a big alternator. I try to avoid roots types because they are bloody inefficient. If budget is not an issue go with a Whipple http://www.whipplesuperchargers.com/products.asp They are absolutely incredible!! I would use mild boost 4-6 lbs max to keep the effective compression ratio down and more octane may be called for.

I have a Chevy C30 with a 454 built similarly to yours and am verry happy with it.
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Old 11-20-2007, 09:58 AM
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Hey Duncan, there's a hotrodder in your area named Tim Stevens. He has built a blown(6-71) T-bucket and is a member of a club there in Adelaide with several blown hotrods. If you don't know him (all you Ozzie's know each other, right?) you can hook up with him at tims@senet.com.au. Tell him Lee in KC sent ya.
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Old 11-20-2007, 10:40 PM
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Thanks folks.. I've checked the whipple site out and I'll contact Tim locally.. I dont know him alas.. there is 20 Million people here But I am in the same city, so thats a good start

Cheers, Dunc.
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Old 11-21-2007, 12:37 AM
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You need one of these Rear mounted turbos ...Either add a electronic water/methanol injection system or lower the cr of the engine to run high boost. No hood scoop required.
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