Landracing Forum Home
October 17, 2017, 11:41:52 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News:
BACK TO LANDRACING.COM HOMEPAGE
 
   Home   Help Search Calendar Login Register  


(Note: Donations are not tax deductible)







Live Audio Streaming and Archives of Past Events
Next Live Event: TBD
Pages: [1]   Go Down
  Print  
Author Topic: Lakester k class engine options?  (Read 973 times)
0 Members and 1 Guest are viewing this topic.
Haaland
New folks

Offline Offline

Location: Fizzy Water, Florida
Posts: 3




Ignore
« on: August 31, 2017, 10:28:55 AM »

Hello,

I have been dreaming of building a lakester for probably 15 years. Over the last 2 I have been toying with the idea of a blown gas k class lakester. What engines are people running in this class? From the rule book it needs to be 30.99ci or 507cc. Engines I have looked into are 500ex, 300-400cc two strokes, Dual trx250r engines, and most recently a phaser 500 snowmobile engine.

The phaser seems the best option stock putting out around 80hp and people have turboed  them up to 140hp. Plus they are already efi.

- Alex
Logged
tortoise
Sr. Member
****
Offline Offline

Age: 75
Location: Sequim, WA
Posts: 539




Ignore
« Reply #1 on: August 31, 2017, 12:41:37 PM »

600cc sportbike motors are very well developed. Destroked to 500 with a suitable cam ought to make good power.
Logged
Haaland
New folks

Offline Offline

Location: Fizzy Water, Florida
Posts: 3




Ignore
« Reply #2 on: August 31, 2017, 06:12:56 PM »

Thank you. I will start looking that route. Destroking or sleeving cylinders never crossed my mind.
Logged
grumm441
Hero Member
*****
Offline Offline

Location: Wazavudu Bellytank Spirit of Sunshine Bellytank
Posts: 1393

HK 327




Ignore
« Reply #3 on: August 31, 2017, 06:24:39 PM »

A number of the 600cc sports bikes also have a 400cc variant.
Some of them share bore size and spacing but have a shorter stroke crank
G
Logged

Chief Motorcycle Steward Dry Lakes Racers Australia Inc
Now with stars
I build it, Goggles tries his hardest to break it
Stainless1
Administrator
Hero Member
***
Offline Offline

Age: 66
Location: Wichita KS
Posts: 6421


Robert W. P. "Stainless" Steele Wichita, Kansas



« Reply #4 on: August 31, 2017, 09:50:15 PM »

You probably don't want to sleeve... could crowd the valves a little too much.  My thoughts have leaned toward the RZ 500 or a destroked 600...  Don't worry, we destroked a Busa a bit over 9/16 to make it under a liter.  There are a coupe of places that will do that.
Logged

Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
jpm49c
Full Member
***
Offline Offline

Posts: 68




Ignore
« Reply #5 on: August 31, 2017, 09:58:11 PM »

What company did the destroke for you "Stainless"?  Thanks!
Logged
Stainless1
Administrator
Hero Member
***
Offline Offline

Age: 66
Location: Wichita KS
Posts: 6421


Robert W. P. "Stainless" Steele Wichita, Kansas



« Reply #6 on: August 31, 2017, 10:08:08 PM »

Marine did the crank, I trashed it on the Dyno during a 30 second 12K pull, so then I had Mile High Crankshaft fix it, true and polish it... Crankshaft Dave said he would destroke one for me it that one didn't hold up... has done 16 five mile pulls and several shorter ones on the Great White Dyno so far.
Logged

Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
Milwaukee Midget
Global Moderator
Hero Member
***
Offline Offline

Age: 57
Location: Beerhaven, Wisconsin
Posts: 5910


Bonneville I/GT record holder - 122.539 mph


WWW
« Reply #7 on: August 31, 2017, 10:16:45 PM »

I'm a fan of destroking as well, but consider this - find an easy-to-develop 1 liter and remove two pistons.

There are a ton of hi-zoot 1 liter bike engines that I think this trick would work well on.

Welcome aboard, Alex! 
Logged

"Problems are almost always a sign of progress."  Harold Bettes
Well, I guess we're making a LOT of progress . . .  rolleyes

We are NOT rebuilding . . . We are reloading.

GOD SAVE MG - The Queen can take care of herself!
Jack Gifford
Hero Member
*****
Offline Offline

Age: 77
Location: Phelps, NY
Posts: 1030





Ignore
« Reply #8 on: September 01, 2017, 12:07:03 AM »

You thinking blown or n/a? Gasoline or 'fuel'?
As of a few years ago the blown SCTA records in K-lakester were quite "soft", at least 25 mph under unblown records. [or my tired eyes misled me....] huh
« Last Edit: September 01, 2017, 12:12:48 AM by Jack Gifford » Logged

M/T Pontiac hemi guru
panic
Sr. Member
****
Offline Offline

Age: 72
Location: Lynbrook, New York
Posts: 754



WWW

Ignore
« Reply #9 on: September 01, 2017, 09:27:47 AM »

Remember that de-stroke may mean too high rod ratio, heavier piston, lazy TDC breathing.
Logged
Milwaukee Midget
Global Moderator
Hero Member
***
Offline Offline

Age: 57
Location: Beerhaven, Wisconsin
Posts: 5910


Bonneville I/GT record holder - 122.539 mph


WWW
« Reply #10 on: September 01, 2017, 11:10:31 AM »

Remember that de-stroke may mean too high rod ratio, heavier piston, lazy TDC breathing.

Not to mention a very busy series of valve and piston events in close proximity during overlap.
Logged

"Problems are almost always a sign of progress."  Harold Bettes
Well, I guess we're making a LOT of progress . . .  rolleyes

We are NOT rebuilding . . . We are reloading.

GOD SAVE MG - The Queen can take care of herself!
salt27
Hero Member
*****
Offline Offline

Age: 60
Location: S.W. Orygun
Posts: 1233





Ignore
« Reply #11 on: September 01, 2017, 01:51:37 PM »

I know of at least two Honda CBR600 engines that have been destroked to 500cc's that compete at Bonneville.

  Don
Logged
Rex Schimmer
Hero Member
*****
Offline Offline

Age: 74
Location: Fulton, CA
Posts: 2117


Only time and money prevent completion!




Ignore
« Reply #12 on: September 01, 2017, 07:44:51 PM »

I like your thinking about runninig Dual trx250r except multi engines are only allowed in the streamliner class and the large motor cycle classes. I would really try to see if you could find something in a 500 cc two stroke, Bonneville is all about horse power and a good two stroke will make more than a four stroke of the same displacement. I would look at some of the snowmobile engines as some of them are big power. Another thought would be the Yamaha twin cylinder, water cooled, two stroke that they ran in one of their ATV several years ago, I have hear some pretty big numbers for them also. Brant and Speranza ran a small Honda four cylinder (destroked  600 I think) and they are pretty good engine builders. The record is 202 so you need a good car with a good shape and some pretty reasonable hp, probably 125 +.

Rex
Logged

Rex

Not much matters and the rest doesn't matter at all.
Haaland
New folks

Offline Offline

Location: Fizzy Water, Florida
Posts: 3




Ignore
« Reply #13 on: September 03, 2017, 09:09:41 AM »

Thank you for everyone's responses!! The plan was to run blown gas.  I have started to look into bigger engines.  Again, thank you all so much very helpful.

-Alex
Logged
NathanStewart
Hero Member
*****
Offline Offline

Age: 36
Location: So Cal
Posts: 1165





Ignore
« Reply #14 on: September 14, 2017, 02:28:52 PM »

I'm a little late to the party but I know guys that run 600cc bikes in 450cc Super Bike road racing classes by disabling one cylinder.  Having a custom crank made for destroking ain't gunna be cheap.
Logged

El Mirage 200 MPH Club Member
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!


Google visited last this page October 15, 2017, 06:34:02 AM