Hey guys , I have my 91 V Max , im not to concerd about keeping the motor original because its not the original motor , i want to make it SUPER mod for racing , Any ideas , pipes , Porting , shaving the heads , carbs , Ill be taking the air box out and running Uni filters , i was planning on bringing the motor to a local performance shop for them to port and polish and shave the head , Is there any way to shave the heads for alot of compression and run high octane ? And what should be in it for head gaskets ? jus the rubber seals ?
Thanks guys , im 17 and learning right now any help would be great
V max mods ?
Chris, The mods you are talking about are going to cost a fortune and if not done RIGHT!!!! by someone that knows these engines will be a complete dissappointment AT BEST. These old Vmax's will hold there own and in the right hands can be real terrors but there is NO SUCH THING as a stock bodied SUPER MOD 1991 540 Vmax. There are so many variables and when you are talking MOD you have entered into a world of vintage and modern HOT RODS that is VERY VERY TOUGH. I'm not saying that it is impossible but even for someone that has years of experiance with modding and racing these sleds it is going to be tough to compete in actual MOD racing and a 1991 is not considered vintage so you are going to be running against modern technology that has a much larger availabity of mod type parts and you will be out classed very quickly. You have a special sled there so do it justice and restore it. You won't be king of the hill but you will have somthing that will DRAW ALOT of attention wherever you go. Racing is a tough buisiness, most guys don't remember who they beat or who they got beat by but they ALL remember the guy that had that cool old (rare) sled that just showed up to run. They will talk about how good it looked and how well it did against the new sleds even though it was 16 years old. You won't be embarassed or dissappointed in a good running stock 91 Vmax but you will have others drooling over it.
Phil (opsled)
Phil (opsled)
Ya i have the original 91 motor and pipes coming for it , that would be the restored part , im keeping every thing else on the outside original , except plastic skis , I want to set it up for drag racing , with the 1983 motor thats in it now , So theres not to much to do in the way of carbs , pipes , heads , and ports ?
Hi Chris, There is alot that can be done but not much in the way of bolt on type mods that will show much improvment over a stock well tuned sled. The stock pipes are about the best you can get untill you get into serious porting and head work. If you just clean and polish the ports without getting into reshaping or enlarging you will see some improvment. If you want to port for mod you need to take the head and cylinders to someone that knows what they are doing and has experiance with THESE engines. Guys that know them can get alot more out of them but there arn't many people out there that can do it right. It is very expensive work to have done and you could spend $500 to $1000 on cylinder and head work. If it is done wrong you could get spanked by a stocker and then have an expensive set of junk cylinders. Good stock cylinders are getting very hard to find for these engines and I would hate to see a set get ruined by someone that doesn't know what they are doing. Alot of the info for modding these engines has gotten lost over the years or is buried in the minds of guys that used to run them. If you are serious about building a mod 540 you need to find one of these guys and be willing to lay out some serious cash. I've never met him but I guess Delaughter was one of the 540 guru's but I don't know if he is still doing them or not. Tim Bender raced them and had good luck along with Olaf Aaen. I use Pete Nydall of Nydall machine here in Kenosha Wi. He worked for Olaf back in the day and still does alot of work for him. Pete knows them very well and when I took the cylinders from my mod to him he took one look, did some measuring and said whoever did this porting job knew what they were doing and that the head should be cut .010 to match the port job which it was. The engine work is just the start and you will then need to work on carbs, jetting, pipes, clutch setup, gearing, ect. It is alot of messing around and there just isn't a simple step by step book that tells you what you need to do. You will probably do just as well and have just as much fun running a well tuned stocker in stock classes.
Phil (opsled)
Phil (opsled)
opsled wrote:. I've never met him but I guess Delaughter was one of the 540 guru's but I don't know if he is still doing them or not.
Phil (opsled)
I have Delaughter working on my 540 oval motor as we speak. Not getting too crazy with the motor as I still need to run the stock exhaust. Really looking foreward to putting this ol '83 on the ice this winter
go fast, turn left..look cool
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Undertaker#13
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- Joined: Sun Apr 29, 2007 6:44 pm
- Location: Death, Valley
Mod Vmax?
If you are ported and polished! Shaving the heads is a plus! 
Clutch bolt
Hey guys , , , Any one know the thread size for the clutch bolt , , ,not the puller the bolt , i couldent get mine out with a easy out , So i drilled it out theres a thread showing so i can start the tap But what size is the bolt ? Thanks guys
My bolt is a 1/2-20.
Everyone told me it was metric, but I used a 1/2-20 tap to clean up the threads after the puller bent some of them.
Taps come in two flavors. One that produces a tight fit and one that produces a loose fit. The first tap I tried was several thousandths larger than the second one. I could not get the first tap to go in without binding. The second one did the job right. If you put an old Ford lug nut on the two different taps, they feel different.
Everyone told me it was metric, but I used a 1/2-20 tap to clean up the threads after the puller bent some of them.
Taps come in two flavors. One that produces a tight fit and one that produces a loose fit. The first tap I tried was several thousandths larger than the second one. I could not get the first tap to go in without binding. The second one did the job right. If you put an old Ford lug nut on the two different taps, they feel different.