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Hey there guys,
Need to ask an open ended question that is similar to asking how long is a piece of string !! At present we run an 83gpz 1100 in our little z9 drag bike, 1170 wiseco kit,welded crank,40mm trons and a dead stock head and cams. Since the installation of a nos kit we have got it down as far as 9.52 @139 with the smallest jetting supplied, 36 hp. We want to take the next step and nudge the 9.0 mark. What is the next step in getting closer towards the goal Many may say more spray But is looking at the head and cams to get a better base power plant the safer and more consistent option All ideas greatly appreciated.
Pete
Any one
Cams Pete,
I would suggest that you will get further improvement in time by going to some race cams, not to large but something that you can still use after the head is flowed at a later stage. After the cams if you don't go quick enough you can spray some more
Phil
Thanks phil,
As you to well no we will keep the spray to a minimum and start searching elsewhere for improvements.Have started the search for the right type of cam to use and it is not going to be an easy task.A big friend of yours who wears braces offered us the use of some of his heads ect, may have to contact him and see if he remebers the statement Will keep it the way it is till after the winters and work until then to get a consistent bike back under me butt.
Beers an Cheers
Pete & H
I'd go with more spray as the engine stands today. The cam change will increase the RPM which maximum torque is made thus increasing hp but the higher RPM will place more stress on all reciprocating pieces decreasing reliability and increasing parasitic losses. Keep your RPMs where it is and put the juice to it. You should be able to net90-100 hp increase over stock with a wet nitrous system without having to get too technical about it. Just keep the gas supply on the rich side.
It is commonly misunderstood that nitrous systems are hard on engines but that is not true. Not when you compare it to other methods of acheiving similar power gains. It is MUCH easier on the engine, and your pocket. However, just like any performance modification, if you do it wrong it'll cost ya.
Thanks Phil,holeshooter.
Will be taking both your pieces of advice in regards to the next step,after we fix sundays little mishap hey phil
How many of you kwacka gurus out there are willing to pass on some enginespecsand details and help us with the next step in our plan We want to keep the cc at 1170 so where do we go with the head and cam selection Will be bumping the nos up a step to 18/20.
Pete
Cmon guys you have got us this far, any ideas on the next jump Next sunday we are bumping the nos to 20/18 and hope to hold a consistent 9.5 arvo of 4 passes, we have done that number with the smaller jets but to get consistent numbers for our class i believe we should give it more and be on the safe side of our dial in
Pete
If you have stock cams pick up a set of drop in .425 lift cams , good on there own for a couple of tenths......
I ran 8.98 at 145 with a 1015cc -10.5 -1--1975 kaw,steel tank,chrome fenders,stock front end,stock head,k-13 cams(.410)33 smoothbores,dyna s and green coils-6 over arm,old 8-1/2"2427and bars backin 1986 with 24-28 nos jetting--bike ran 10.20 with no spray.I weighed about 120 lbs then though.That bike never broke anything and was consistant--spray was on the clutch lever.
I would go with more spray personally.
Originally Posted by funny1
Amigo,
That was real fast for what you had.
Tony
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