6 replies to this topic

[Chris Wilson]

I hope some of you here might be familiar with the Group H class for rally cars? I am trying to find out what mods are allowed and what they do about the live axle location on the popular Volvo 700 and 900 series cars that are run in this category.

Are they allowed to 5 link, or do they have to work with the rather odd asymmetric torque arms and frame the stock car is blessed with?

Photos VERY welcome, as are English language versions of the rules, or foreign ones in a Google Translate recognisable format ;) Thanks! My direct mail is chris@chriswilson.tv

[MatsNorway]

Not really familiar but if your able to download the pdf. and reshare it somehow  i could read some of it. (not sure what my PC is up to, i just get another web identical page when i try to open pdfs.)

 

https://bilsport.no/..._-Nett_2016.pdf

Edited by MatsNorway, 14 March 2016 - 16:07.

[Lee Nicolle]

I have watched on You Tube scores of crashing Volvos in those countrys as well as a lot of Bimmers and Escorts too.

The Volvos do not seem to be much modified, seemingly most are used cars with springs shocks rally tyres and a roll cage.

[MatsNorway]

fixed my pdf reader:

 

Quick and dirty:

 

1. 1. Konkurransebil
Som konkurransebil godkjennes bil som har vært homologert i Gr.1, 2, 4, A eller B samt biler
som tidligere har blitt nasjonalt homologert av NBF.

 

1. 1. competitioncar

As a competition car approved cars will be former homologised Gr.1, 2, 4, A or B including cars previously homologised by NBF.
 

2. homologisation papers shall be available and shown at technical inspection.

 

3. blablabla

 

4. 4. Minimumweight.

The car is to follow the following scale.blabla
(Engines with 2 valves pr. syl max. 3000 cm3)
(Engines with more than 2 valves pr. syl max. 2500 cm3)

up to |z1000 cm3 720 kg
1000 til 1150 cm3 790 kg
1150 til 1400 cm3 840 kg
1400 til 1600 cm3 920 kg
1600 til 2000 cm3 1000 kg
2000 til 2500 cm3 1080 kg
2500 til 3000 cm3 1150 kg
3000 til 3500 cm3 1230 kg
3500 til 4000 cm3 1310 kg
4000 til 4500 cm3 1400 kg

 

For engines with turbo volume is calculated as follows: engine volume x 1.7 (includes wankel)

 

5.

Chances to the original parts

 

blabalbalba

 

can be chanced and made lighter but the original part must still be recognisable.

 

5.1

All addition of material is prohibited. Unless spesified in these rules.

 

All bolts,screws etc can be chanced.

 

6. Homogolised engine only..according to homologisation papers.

 

6.1

Complete freedom to chance valves, valveguides, pushrods and seats.

Number of valves can not be altered if model is homologised with a different number.

 

Your allowed to shim the valves. number of valvesprings and type is free.

Same for mountings for valvestem. (not sure) Lifters and rockers is free as long as they are intercancable with originals.

 

compustion chamber is free. Same is compression. Turbo is kinda free, but only one is allowed. (size restrictions within homologisation) 10% in size etc.

 

For cars with restrictor after international homologistiion max 40mm restrictor.

 

Placement of intercooler is homologised.

 

6.2

Free carb and number. Free intake, intake must be in engine bay.

Must have mechanical throttle control.

 

Carburetor engines can be chanced to injector engines.

 

6.3

injection.

 

6.4

Going up in bore.

 

It is only allowed to mount separate sylinder liners. Material is free. (did you read that Fatboy)

 

Leveling the blokk/headgasket side is allowed.

 

over 500 cm3 up to and including 600 cm3 etc..
over 600 cm3 til og med 700 cm3
over 700 cm3 til og med 850 cm3
over 850 cm3 til og med 1000 cm3
over 1000 cm3 til og med 1150 cm3
over 1150 cm3 til og med 1300 cm3
over 1300 cm3 til og med 1600 cm3
over 1150 cm3 til og med 1300 cm3
over 1300 cm3 til og med 1600 cm3

over 1600 cm3 til og med 2000 cm3

over 2000 cm3 til og med 2500 cm3

over 2500 cm3 til og med 3000 cm3

 

Stuff about if you **** it up and rotary engines.

 

6.5 Rods and crank

 

Material is free, shape is free. Homogolised stroke must remain.

 

6.6

bearings and gaskets..

Glide and roller bearings can be chanced but must remain same type.

 

6.6 lubciation and crankcase ventilation

drysump is only allowed if the car is Homogolised with it.

 

plates in oilpan is free.

 

High capasity pumps is allowed. Oilfilter and cooler is free. Cooler must be on the inside of the car. Unless Homogolised with it on the outside. And not in the coupe.

 

6.7

Oilpressure may be altered blabla.

 

6.8 cams

Free except the number and the number of bearings. Opening and closing times is free.

 

6.9 Piston++

Free.

 

6.10

radiator is free but must remain Homogolised position. Skirts etc is allowed. blabla

 

6.11

Engine mounts.

 

Eingine mounts are free. But must remain the original count.

 

6.12.

exhaust
Free from the head and out. blabla obvious stuff and not to be sticking out anywhere. 100db

 

7.

Driveline

 

7.1

Clutch and swingwheel

clutch is free. clutch housing is free. Homogolised material must be kept. weight of swingwheel is free.

 

7.2

Gearbox is free.

original position.

Geartunnel can be modified to fit different gearbox.

6 gear including reverse maximum.

Gearbox transfer must be mechanical.

 

7.3. Driveshaft

shaft between gearbox and rear gear housing is free.

Edited by MatsNorway, 16 March 2016 - 16:12.

[MatsNorway]

8. Suspension

 

8.1

Front

No strengthening or modification of the Homogolised system si allowed. unless spesified here.

 

Bushings can be altered to a harder quality.

 

Damper brand is free, but not the quantity.

 

Strengthening of the damper towers with a rod is allowed.

 

Springs.

Material and dimention is free. But not the type.

 

Torsjonbars can be altered if they fit on original mounts.

 

linkage can be mounted with "uni-ball" in the attachment points.

 

8.2.

Rear

 

No strengthening or altering of Homogolised suspention is allowed. unless described here.

Stabilsation rod is free. By stabilisation rod it means: Panhard link, watt link, momentumlink and torsjonbar? as long as it does not conflict with other elements in the rules.

 

non Homogolised 4 link must be:

Not mounted longer forward than originallink or spring mount.

Not taller than 20cm between mounts and senter and original floor.

Springtowers may not be taller than sidewindows lowest edge.

 

8.3

Steering

Steering ratio is free. minimum 30cm steeringwheel.

 

Just ask if other elements is of interest.

Edited by MatsNorway, 16 March 2016 - 16:10.

[Chris Wilson]

Superb, thank you very much, this tells me all I need to know, very much appreciated!

[MatsNorway]

No problem.

 

You should ofc. double check this. Quick and dirty remember. Ask for a clarification etc.

Edited by MatsNorway, 16 March 2016 - 18:26.