Greetings all.
I'll save the intros for another thread and get right to the meat of this.
So I have been reading about F600 all over and have failed to find answers to many questions.
So here's a list of questions I have in the hope that someone here can answer or point me to the answer.
If you don't understand my typing, feel free to ask me to clarify.
QUESTIONS:
1] The GCR states:
There shall be no modifications of any component of the engine unless specifically authorized in these rules.
However, to rebuild an engine, the manual states:
If the stem is within the limit, then replace the guide. Re-finish the valve guide holes in cylinder head with the reamer and handle.
So the GCR does not say that the valve guide hole in the head can be modified anywhere, but it is required to rebuild the engine if the valve guide is worn. Does that mean you have to throw the whole engine away in a valve guide is worn past the limits?
rebuilding to the factory specs as stated in the manual is allowed. Modifications are not allowed unless they are stated in the rules. However you will find that purchasing used but very good engines is much less expensive than a total rebuild. For instance, a set of valves for some engines can cost more than $1000.
2] The GCR states:
... stepped exhaust headers are not allowed.
But nowhere is "stepped exhaust header" defined. Should this be submitted to the CRB to define it like other terms are defined in Appendix F?
you are correct. It should be clarified and or defined. I will write a letter to the crb requesting a clarification. What is meant by stepped headers is that more than 1 diameter is not allowed for the primary pipes. This rule was written to contain costs.
3] Per a discussion I read somewhere, it seems like reversing the engine was forbidden. But I do not see that stated anywhere in the rules. By the way the rules sit, it seems like so long you use the stock transmission, you can put anything in the chain-line to drive the rear axle. So, did I miss a hidden rule somewhere or are you actually allowed to reverse the engine? Or even turn the engine longitudinally and drive a pinion gear with a driveshaft into a bevel gear to turn the axle?
you can do that if you want. This has been discussed within the rules committee and the consensus was that it was legal but not advantageous to build a car like that. There is a statement in the GCR that is intended to make sure that the engines are not turned around and this is for the 2 stroke engines. However, I will ask for a clarification on this just to make sure.
4] Section 9 on Page 364 shows some bodywork detail. It seems to imply that the leading edge of the sidepod must be vertical. Is that true or just a simplified drawing?
my interpretation is that it does not have to be vertical. However there are other critical issues that must be complied with. However just because I think that vertical is not required does not mean that I am right. There is a process that is defined in the GCR that allows you to request and pay for a technical compliance review by the club. I suggest that you find and read the "compliance review" section of the GCR. It is a very usefull process and I have used it 3 times.
This section also says that a maximum of 2.5" from the rear of the tire to the front of the pod is allowed when the wheel is in full lock.
Is that before or after the race that it is checked, or is it both? I ask this because if the tire runs on a lot of camber, the tire has the potential to be cone-shaped after a race and may make a gap of 2.5" turn into 2.6" from the inner edge of the tire.
Which brings up another question. Is the measurement at full lock on the outside edge of the tire, or the inside edge of the tire, or both?
any measurement anywhere on the tire will do as long as some point on the tire is within the dimension. Tech can measure this at any time during the weekend so If you are designing a car you had better make certain that you are better than the defined clearance simply because of the things you have already mentioned
5] The GCR states:
Any recognized ten (10) inch racing tire with any tread width up to a designed 7.5 inch width may be used.
Where is the list of "recognized tires" kept?
there is no list. Any race tire that you can purchase will do as long as it meets the required dimensions. Hoosier currently is the supplier of all the tires currently used.
Thanks for all the help. If any of this needs to be directed elsewhere, I'd be happy to do that.
Cheers,
Chris Morgan