Author Topic: History question- When did the Pushrod Class for Motorcycles start?  (Read 8131 times)

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Offline dr j

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I asked a few days ago about the Vintage date of 1956.  My followup question is when and what "pushed" the Motorcycle classes being split with a  Pushrod class.  Understand that I am coming from the standpoint of only having run LSR small displacement bikes at ECTA  for 3 yrs now.  Although I am not currently running in a Pushrod class I know the big performance disadvantage inherent with Pushrods vs OHC etc. so I like the fact that their is a class for the pushrods.  I am more just interested in the history behind the class.  Thanks for the history lesson.
Jarl- Moto Madcap
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250cc 4stroke Nitrous Motorcycle- 131.8mph
250/4 Naked Motorcycle-115.6mph
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Offline dw230

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #1 on: August 02, 2010, 10:46:38 PM »
Scott Guthrie says there are two eras in LSR motorcycle racing.
BH & AH - Before Hayabusa and After Hayabusa

Does that have anything to do with it?

DW
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Alcohol - because no good story starts with a salad.

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Offline willieworld

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #2 on: August 02, 2010, 11:22:48 PM »
1990 was the first year for the pushrod classes----PAG   pushrod A gas ---PAF  pushrod A fuel  willie buchta
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Offline mike mendoza

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #3 on: August 03, 2010, 01:47:49 PM »
get a Harley :-D

Offline willieworld

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #4 on: August 03, 2010, 02:23:58 PM »
You could also get an ace, aermacchi, AJS, ariel, atlas, BMW, boss hoss, brough-superior, BSA, buell, crocker, cyclone, DOT, douglas, ducati, emblem, excelsior, flying merkel, anyway there are many many more  there were even some pushrod hondas--------------------------willie buchta


just a note in 1990 with the pushrod class there was no blown class although there was a blown class in production class

HOPE TO SEE YOU ALL AT BONNEVILLE
« Last Edit: August 03, 2010, 02:27:14 PM by willieworld »
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Offline dr j

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #5 on: August 03, 2010, 03:41:24 PM »
Thanks for the history lesson Willie!  So, since the Hayabusa was not born until 1999 it was not the direct cause.  And I liked your alphabetical listing from A-F of various pushrod manufacturers other than the Harley that everyone knows.  Good Luck to you at Bonneville in 11 days.  I hope to be there next year with my Vintage bike and maybe a pushrod bike also. 
Jarl- Moto Madcap
Sharpsburg MD
BUB2012- Morini 350- 4 Mod Pushrod records, Parilla 175- M-VG rec
250cc 4stroke Nitrous Motorcycle- 131.8mph
250/4 Naked Motorcycle-115.6mph
APS/F-125/2 115.2mph
P/PV-175/4 Moto Parilla-59.7mph
29 Retired Maxton Class Records on 3 bikes and 4 engines

Offline fredvance

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #6 on: August 03, 2010, 04:01:53 PM »
It was my understanding thet AMA came up with the pushrod class and the rules governing what was a pushrod motor because of the new BMW motor that has the cams in a different location and a very short pushrod. Once again catering to the Harleys.
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Offline willieworld

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #7 on: August 03, 2010, 05:22:22 PM »
let me clear up something---you could always race a pushrod bike there just wasnt a pushrod class ---pushrod or not everyone raced in the same class ---you can thank glen he is the one i got the old rule books from                          willie buchta


in vintage everyone ( non pushrod  pushrod and flathead ) race in the same class although the flathead gets a 33.33 percent displacement break ---a 1500cc would run in the 1000cc classand the 56 K would be legal in vintage              
willie-dpombatmir-buchta

Offline k.h.

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #8 on: August 03, 2010, 05:57:58 PM »
And one can ask about the history of when and why aftermarket pushrod motors were dropped from M class . . .
In theory, there is no difference between theory and practice.  But in practice, there is.--Jan L. A. Van de Snepscheut

Offline willieworld

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #9 on: August 03, 2010, 06:52:16 PM »
kh  maybe you could show me where it says i cant run an aftermarket engine  in the m class or a set of aftermarket cases in the m class------------------------willie buchta
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Offline 1212FBGS

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #10 on: August 03, 2010, 07:43:43 PM »
KH... about 3 years ago.... because some guy showed up with a kawi in a Honda frame and another guy butchered an electric motor into a Honda chassis..... the motorcycle tech director was a high up Honda attorney and those conversions were sacrilege

Willie.... page 113

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Offline 55chevr

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #11 on: August 03, 2010, 08:40:20 PM »
As I read the rule,  you can't even have S&S cases in an M bike.

Offline mike mendoza

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #12 on: August 03, 2010, 11:42:45 PM »
willie not such animal    mod   means modified production    no aftermarket     just like u can't run an s&s motor in mod.   it altered    ex   friend Perkens from S&S :cheers:

Offline willieworld

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #13 on: August 04, 2010, 12:17:53 AM »
if you guys are right  and you probably are then why does the buell hold so many records in M when the motor isnt made by the same manufacture as the frame---frame buell motor harley    willie buchta
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Offline mike mendoza

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Re: History question- When did the Pushrod Class for Motorcycles start?
« Reply #14 on: August 04, 2010, 12:57:27 AM »
modified       production            modified production motor    who makes the production bike?