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 Does 1725 go into 1600?
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cdady

United Kingdom
13 Posts

Posted - 20 Aug 2019 :  22:12:49  Show Profile  Reply with Quote
I was wondering if a series V 1725cc engine is a direct fit into a series IV 1600cc car, whether the 1725 uses the 1600 gearbox and what are the rear axles ratios for a non od 1600, and OD 1600 and an OD 1725? A lot of questions - thanks if you can help!

CMDADY

pruyter

Netherlands
280 Posts

Posted - 21 Aug 2019 :  07:03:35  Show Profile  Reply with Quote
The engine fits right in. All non overdrive cars have a differential with a 3.89 ratio while the overdrive cars have a 4.22 ratio diff.

Regards,

Peter
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828CC

United Kingdom
18 Posts

Posted - 21 Aug 2019 :  08:41:25  Show Profile  Reply with Quote
Might be worth noting the change of earthing between the series IV and V when considering the choice of ancillaries....
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pruyter

Netherlands
280 Posts

Posted - 21 Aug 2019 :  14:50:34  Show Profile  Reply with Quote
There are more differences like for instance an alternator instead of a dynamo and the carburettor plus manifolds differ but the question was: will it fit directly and the answer is yes.

Regards,

Peter
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828CC

United Kingdom
18 Posts

Posted - 21 Aug 2019 :  15:28:10  Show Profile  Reply with Quote
Not disputing that at all, just trying to point out a few other considerations when doing this transplant. According to contempory literature there were small ratio changes between the Series IV and V gearboxes along with the clutch plate size. So perhaps prudent to check if the splines are the same?
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pruyter

Netherlands
280 Posts

Posted - 21 Aug 2019 :  21:02:36  Show Profile  Reply with Quote
The splines changed at the very late series V, the size of the clutch plate changed during the series IV when the first gear became a synchonized one and at the same time the clutch press plate changed from springs to diafragma.

Regards,

Peter

Edited by - pruyter on 21 Aug 2019 21:04:03
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Commerlad

United Kingdom
11 Posts

Posted - 23 Aug 2019 :  20:28:02  Show Profile  Reply with Quote
Full list of ratios For Arrows cars,
3.70
3.89
4.22
4.86

All were used standard transmission Non Overdrive

Dependant on location



Sometimes I think laterally, but then I have to get up!
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cdady

United Kingdom
13 Posts

Posted - 16 Sep 2019 :  09:36:08  Show Profile  Reply with Quote
Many thanks to all - very helpful
Chris

CMDADY
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