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Author Topic: CZ380 71 42hp V CZ400 73 37hp  (Read 3590 times)

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Ji Gantor

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CZ380 71 42hp V CZ400 73 37hp
« on: January 16, 2009, 10:34:30 pm »
I have just looked at the compliance plates of both the 71 and 73 CZ 380's and noticed that the 71 has 42 hp while the 73 only has 37hp.

As Julius Sumner-Miller used to say

WHY IS THIS SO 
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Offline holeshot buddy

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #1 on: January 16, 2009, 11:01:24 pm »
those figures seem a bit inflated to me
czs are good bikes but ::)
were are all the cz gurus  ??? or firko ;)
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Ji Gantor

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #2 on: February 08, 2009, 07:58:12 pm »
These are the numbers stamped into the compliance plates.

I am not sure but this may be the answer.

In 1971 CZ gauged their engines by BHP break horse power.
In 1973 CZ gauged their motors by DIN HP.

Break horse power is measured at the fly wheel, while DIN is measured at the rear wheel.

Ji
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Offline paul

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #3 on: February 08, 2009, 08:23:27 pm »
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Ji Gantor

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #4 on: February 08, 2009, 09:44:38 pm »
Yes paul I have seen that to but CZ stamped 37 HP on the compliance plate of my 1973 400 while I have seen 42 hp stamped into a 1971 compliance plate.

Very Odd.

Ji
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Ji Gantor

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #5 on: February 14, 2009, 11:22:33 pm »
Well what porting differences were there between the 1973 black frame and the 1974 red frame CZ400s.
I know the swingarm was modified and most likely the forks and shocks.

Ji
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Offline shortshifter

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #6 on: February 21, 2009, 07:08:02 pm »
That czmadness site is insane!
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Ji Gantor

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #7 on: February 21, 2009, 09:55:46 pm »
Hi shortshifter,
Yes that web site is very informative.

Ji
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Offline cloggy

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #8 on: April 17, 2009, 06:48:38 am »
The Roger Decoster influenced RM400 had less peak power than the earlier RM370.
On the road the RD400 also had less peak power than the RD350
Both bigger bikes had wider torque bands and so were faster bikes on track and road
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Offline Bamford#69

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #9 on: April 17, 2009, 09:09:08 am »
HI Ji
 CZ's have BRAKE horse power (BHP)
 Maico's have BREAK horse power
LOL
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Offline Nathan S

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #10 on: April 18, 2009, 08:33:26 pm »
My first thought is that they were probably being more "optimistic" for the earlier bike.

Ever seen the HP figures stamped into an old Datsun's factory ID plate? Ever been in a car that actually makes the HP that Datsun claimed their cars made?;)
Factories are not above optimistic claims to help sell stuff...

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The good thing about telling the truth is that you don't have to remember what you said.

Oggy Doggy

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Re: CZ380 71 42hp V CZ400 73 37hp
« Reply #11 on: April 18, 2009, 08:38:09 pm »
No idea Ji, just Czech weirdness I guess. Welcome back by the way.
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