| [ Total Views: 768 | Total Replies: 6 | Thread Id: 92515 ] |
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 telf
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| posted on September 6th, 2011 at 08:45 PM |
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1641 Questions
Hi all im building a 1641. The bottom end is already put together. Its got a counter W Crank, matched connrods and a Scatt C25 Cam im just wondering
if i should put some new up rated springs on the valves or leave as standard. Also what would make a good combo for the rockers, ie 1.25 or just
leave as standard. It will also have some mild ported twin port heads.
thanks for reading hope you can help
Telf
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JonR356
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| posted on September 7th, 2011 at 07:29 AM |
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That should rev significantly higher than stock, assuming you're putting some decent carbies on, so I'd go with some uprated single springs and
retainers and bolt up rocker shafts.
Personally I'd stick with standard rockers too.
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 matberry
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| posted on September 7th, 2011 at 08:24 AM |
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Me too, HD single springs, a pair of carbs and good rocker swivel feet adjusters and shimmed with a HD rocker shaft kit with stock ratio rockers. My
2c
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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JOE568
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| posted on September 7th, 2011 at 12:14 PM |
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I have a counter crank,mild cam and lighternd flywheel....ive got stock springs and rockers as i was told thay would be sufficent and reliable...itl
rev to 5000rpm and higher with no probs..doesnt seem to have any noises....
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matberry
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| posted on September 7th, 2011 at 12:34 PM |
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No noises, but will it see 100 000km reliably?
The heavier springs are because the engine can accelerate quicker, has a higher rate of change.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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JOE568
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| posted on September 8th, 2011 at 12:08 PM |
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Il let you know in 10 years......
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telf
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| posted on September 8th, 2011 at 05:00 PM |
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Thanks for the advice. Think i will go standard for he time being then upgrade soonish when the funds become available.
Thanks again
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