Engine set back

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Avgas34
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Engine set back

Post by Avgas34 » Tue Aug 27, 2013 5:42 pm

G'day all, just trolled the forum for an understanding on engine set back. I do not as yet have a current rule book to draw this info from, but its coming! Does percentage of set back pertain to the engine as originally fitted to the model of vehicle that is being built , ie percentage from its original position or is it exclusevly to wheel base and is it measured from the front axle centre line to the leading spark plug hole either way? cheers Wayne

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JonB
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Re: Engine set back

Post by JonB » Wed Aug 28, 2013 4:29 pm

Hi Wayne

Probably not going to be much help as I'm more I to bikes.

What class are you planning on running in?, will have a squiz at the rule book tonight.

jon
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Underhouse Engineering

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Re: Engine set back

Post by DLRA » Wed Aug 28, 2013 10:50 pm

It all depends on what type of vehicle your running.
You need to be more specific when you start asking technical questions.

2013 DLRA Rulebook

SECTION 4 DEFINITIONS
The following is a list of terms used by the DLRA Contest Board and their meanings
4.AA SET BACK:
The feature of a car which is represented by the formula D/WB where D is the distance measured from
the front spindle transverse centerline to the front-most sparkplug hole or centerline of the front most
cylinder on compression ignition engines and WB is the wheelbase.

5.B.1 Modified Roadster - /BFMR, /FMR, /BGMR, /GMR
Any type of frame may be used, and the engine may be set back 50% of the wheelbase.

5.B.2 Fuel-Gas Roadster - /BFR, /FR, /BGR, /GR
Engines may be set back 25% of the wheelbase.

5.B.3 Street Roadster - /BSTR, /STR (Gas only)
A maximum of 15% engine set back is permitted to permit adequate clearance for water pump, blower drives, etc.

5.B.4 VINTAGE COUPE Classes:
The engine shall be set back a minimum of 25% of the wheelbase. The engine setback cannot exceed 50% of the wheelbase.

5.B.5 Vintage Oval Track /VOT, Midget Vintage Oval Track /MVOT
Excessive engine set back is prohibited. The most rear edge of the engine block may not extend inside the cowl section

5.D MODIFIED CATEGORY
Within the Modified category the amount of modification determines the class. For example, a Gas Coupe is basically a Production car with an engine swap, an Altered is a Gas Coupe with headlights and grille covered and the engine set back, a Competition Coupe is an Altered with the nose lengthened and streamlined.

5.D.1.a Competition Coupe & Sedan - /BFCC, /FCC, /BGCC, /GCC
The engine shall be set back a minimum of 25% of the wheelbase. The engine setback cannot exceed 50% of the wheelbase.

5.D.1.b Competition Ute - /BFCU, /FCU, /BGCU, /GCU
The engine shall be set back a minimum of 25% of the wheelbase. The engine setback cannot exceed 50% of the wheelbase.

5.D.2.a Altered Coupe - /BFALT, /FALT, /BGALT, /GALT
The engine set back a maximum of 25% of the wheelbase as defined in Section 4.AA.

5.D.2.b Altered Ute - /BFALTU, /FALTU, /BGALTU, /GALTU
The engine set back a maximum of 25% of the wheelbase as defined in Section 4.AA.

5.D.3.a Gas Coupe - /BGC, /GC
The engine may be set back a maximum of 2% of the wheelbase.

5.D.3.b Gas Ute - /BGU, /GU
The engine may be set back a maximum of 2% of the wheelbase.
Keep the shiney side up........
DLRA WebMaster / Editor

Avgas34
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Joined: Tue Aug 20, 2013 2:20 pm

Re: Engine set back

Post by Avgas34 » Thu Aug 29, 2013 7:27 pm

Thanks both Jon and the Webmaster / Editor. The answer to my question has been given. I did not spec the vehicle untill I had an understanding of the answer! I am aiming for Fuel Altered Coupe, Roadster and Competition coupe with the use of 2 bodies. Thanks again for taking the time to reply, cheers Wayne

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Re: Engine set back

Post by DLRA » Sat Aug 31, 2013 5:24 pm

No Probs Wayne, better to ask questions now.

There is a list of people who can help you with your build as you go.
We have delegates in most States now so they can cast an eye as your building.
And there are Category specialists that you can contact for specific class rules.
Have a look at the Contact Us page
Keep the shiney side up........
DLRA WebMaster / Editor

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