Top speed on 500 interceptor?

Hi all, new here so forgive me if I did something wrong. I run bikes on the El Mirage dry lake bed with the SCTA. I am curently building a 83 500 Interceptor to run next year. The course is 1.3 miles in the dirt from a standing start. the current record for the class I will be running is 126mph. Is this doable will minimal $$$$?
more info on the SCTA here
SCTA Home Page

 

Yes with the following conditions:

1. Has racing cams
2. Coils replaced with upgraded kit
3. Bridgestone BT-16 tires for smalll and faster profile
4. Cliff
5. Throw bike off cliff

 

I have an 84/85 vf500ff (who even knows what the extra f means?). If you weigh under 140, remove a lot of weight from the 500 (totally doable, but it wont be road worthy anymore), I think you can get close. I see claims that in stock form it's top speed is 128, but I don't really see that happening.

Things to note on pre 86 models: when the valve adjustment is a little on the tighter side of recommended specs, the vf500 is difficult to start, idles poorly, but has a lot more get up and go in my opinion. Properly adjusted valves on this bike provide a nice smooth ride, but I noticed a significant decrease in power. I believe the 86 500's had "more aggressive cams" allowing the intake valves to go a little deeper for "moar" power. This might be crack talk though, but it would support what I've seen.

 

Also, can you send me the requirements for the class you are entering? I could not find it, and this top speed idea really interests me.

 

"915B 250CC P-P Mercury Gear Grinders James Manning 135.797 134.029 226" Holy hell. Unless there a year restriction on your class, this is not going to work out.

 

There are several different classes from production stone stock to a modified supercharge on fuel. I will be running a modifeid frame on gas, longer, lower, lighter, Limited to 500cc. If thats IF I get a record they will impound the bike and all they will check is bore and stroke and test the fuel, everything else is unlimited with no rules. Unfortunately there are no cliffs where I run?

 

how high would the cliff need to be?

 

I know the perfect one:

Grand Canyon, AZ - Google Maps

 

yew haw that'll be on ehell of a ride

 

so the only limit you have is no forced induction and 500cc?

 

500cc and pump gas
I've been running out there for a few years now and hold NO records but its still a kick-in-the-ass everytime I run. I know it might not be the ideal bike for what Im doing but it was aquired on a salvege title and the price was right so Im gonna give er a go! So without running it off a cliff what is top speed on these things run stock and then what steps should be taken to find speed? I know NOTHING about this bike.

 

**well gearing will help you can find out that stuff online by searching.
depending on the funds you have.
cams ( you could have a stock set reground to your specs ) look to see if anyone makes a set w/ more lift and duration.
**bigger carbs and loose the air box, jetting might drive you nuts but you are only looking for speed not drivability.
get a dremel tool and do some porting and or polishing. hit or miss on this one but I have done a few w/ good results. ( and some not )
**degree the cams, make notes move them around to see what gives you the best top end.
lighten up crank, rods and pistons if you can. also flywheel if possible.
lighter tires, rims, chain and that kinda stuff. If it is on the bike and you dont need it to run, remove it.

modify the windscreen to give you a better bubble to tuck in behind.

 

I've owned 4 of these bikes and as far as the speedometer reading goes, I don't think I've ever seen it over 115 MPH with a stock motor and stock gearing.

 

I've had my 500 up to 100 mph (indicated) in stock trim and still had two gears to go. I don't believe I was tached out either.

-Jake

EDIT: You can use Gearing Commander to play with gearing and see what that will do.

 

Stewart, jakobi, thanks thats what i wanted to hear!! Vfr rider that all sounds good but did i mention i build on a very small budget (ha)

 

some of the stuff you can do yourself.
degree the cams, mill the head, rejet the carb and remove air box. rip off any un needed items on the bike. <<< most bang for the buck.

 

I've changed my mind to thinking that it's totally doable on a budget, but the engine will drop a valve after 2 dozen top speed runs, at the very best. Honestly, that really isn't all that bad for a shot at a title.

In addition to what has been mentioned, I'd remove the fuel tank and replace it with a small bottle enough for a full run and enough to get you back to your "pit", and remove the radiator, and pipe the hoses back into itself. This would let you still have a temp gauge, and your going to go down and back. It will get hot, but not enough to kill it- it's not like the engine is going to last long anyways, and thats considerable weight. The smaller gas tank will save weight, and give your engine more air.

 

Not to be that Kawasaki owner that freaks about his RAM air, but those unfamilair with it should check this out: http://www.sportrider.com/tech/146_9508_ram/index.html

Ideal for this application.

 

DID YOU SAY RAM AIR?

 

I think it's doable for sure. The biggest challenge might be the distance, 1.3 miles from a standing start isn't that far. A 500 can hit 125mph in stock trim given some distance. Assuming you can massage the bike, getting quite a bit more speed out of it should not be a problem.

Good luck!