Author Topic: A10 Steel Conrods  (Read 2112 times)

Online chaterlea25

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A10 Steel Conrods
« on: 04.02. 2014 21:02 »
Hi All,
I just saw these on the MAP cycle website
The price is good,
Has anyone the original rod weights to compare them to?

http://www.mapcycle.com/map/index.php/categories/engine/bottom-end/con-rods/conrod-a10-late-6-5-4340-h-beam-p-r.html

Regards
John
1961 Super Rocket
1963 RGS (ongoing)

Offline wilko

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Re: A10 Steel Conrods
« Reply #1 on: 04.02. 2014 21:54 »
Pity they aren't for Plunger models. a mate will be getting his rebuilt soon.

Offline Briz

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Re: A10 Steel Conrods
« Reply #2 on: 05.02. 2014 00:20 »
They'd fit a plunger with a large-journal crank.
There would be little point in fitting heavy duty 4340 rods to a small journal crank.

Offline duTch

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Re: A10 Steel Conrods
« Reply #3 on: 05.02. 2014 07:01 »

 From memory the stock LJ rods are ~360 grm, 110/250 (top/bottom), I'll have to hunt down the notes I made.

 Thunder Rods are  440 grm- 130/310
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Online chaterlea25

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Re: A10 Steel Conrods
« Reply #4 on: 05.02. 2014 19:25 »
HI All,
So it looks as though these steel rods are almost the same as the Thunder rods ??

MAP steel rods,
    120.4 gram small end
    320 gram big end
    440.4 grams total

I have a set of MAP alloy rods but have not looked to see what the weights are ??

Regards
John
1961 Super Rocket
1963 RGS (ongoing)

Online KiwiGF

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Re: A10 Steel Conrods
« Reply #5 on: 07.02. 2014 00:08 »
At the risk of promoting my own post, this post below has a quite a lot of info ref con rod weights etc, but only for SJ crank parts...

http://www.a7a10.net/forum/index.php?topic=6086.0

I used Thunder Engieering rods in my engine build, 3000 miles so far and going fine, I did not bother to rebalance the crank to allow for the rods not being std. I only really notice a bit of vibe over 50 mph, but it is not particularly excessive and still not a problem at 75mph, but I've not ridden another A10 to compare it too....well that's not true I did ride one in the 70's....
New Zealand

1956 A10 Golden Flash EA7-168x, CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

1949 B31 rigid “400cc hot rod” (favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, missing parts so mission impossible?

1952 Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why, maybe cos it always starts

Offline Topdad

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Re: A10 Steel Conrods
« Reply #6 on: 07.02. 2014 11:25 »
Morning John, have a look on ebay , bsa  a10 con rods , map rods new old stock £ 137.oo each ,may be of interest cheers Bob.
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Online chaterlea25

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Re: A10 Steel Conrods
« Reply #7 on: 07.02. 2014 17:34 »
Hi Bob
Thats where I first saw them, Same price as from MAP direct $US 450 a pair
The MAP rods's I got are alloy, I got them sent to a friend in USA who then brought them
over with him on his next trip  *smile* saving me quite a packet  *smile*

In Sept 2011
SRM rods were £336 = $US 525
Thunder Eng    £318 = $US 500 (including post)

The MAP rods at time time worked out at about $US 370

Theres interesting reading on the R&R website discussing the relative merits of alloy vs steel rods
According to an ebay seller these are the "W" brand rods ??

http://www.rrconnectingrods.com/aluminum-connecting-rods/aluminum-connecting-rods.html

http://www.rrconnectingrods.com/steel-connecting-rods/steel-connecting-rods.html

Cheers
John
1961 Super Rocket
1963 RGS (ongoing)

Online KiwiGF

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Re: A10 Steel Conrods
« Reply #8 on: 08.02. 2014 03:10 »
that thunder engineering cost looks high, does it include 20% vat ? if so then vat does not get charged if they are being exported, like mine were, I think I paid 250gbp plus freight a couple of years ago.
New Zealand

1956 A10 Golden Flash EA7-168x, CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

1949 B31 rigid “400cc hot rod” (favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, missing parts so mission impossible?

1952 Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why, maybe cos it always starts

Online chaterlea25

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Re: A10 Steel Conrods
« Reply #9 on: 08.02. 2014 16:57 »
HI Kiwi,
That was including VAT and delivery to Ireland, Vat on £15 delivery too !!

John
1961 Super Rocket
1963 RGS (ongoing)

Offline dan daughenbaugh

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Re: A10 Steel Conrods
« Reply #10 on: 08.02. 2014 22:28 »
You should call first, Looked into them a few years ago and they had not produced them in some time.
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Offline Rocket Racer

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Re: A10 Steel Conrods
« Reply #11 on: 31.12. 2019 00:33 »
thanks for this info on the relative weight of the billet alloy vs std, vs MAPcycle steel rods
Given all the original rods are now coming on 60-70 years old and subject to fatigue, I'm moving towards steel rods for my next rebuild. If the comparative weights are accurate, the big end increase being primarily rotational will have less effect and the steel rod small end appears to be closer to std than the billet rod.

Will still pay to try and keep piston weight down but I'm convinced. Mind you my steel capped alloy rods have coped with a lot of abuse (only using 6" rods though)
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
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