| Stay with the 74 crank |
| Go for the 78 crank |
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80% |
[ 4 ] |
| Other |
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20% |
[ 1 ] |
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| Total Votes : 5 |
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| Author |
Message |
MitchS046
Samba Member
Joined: March 02, 2020
Posts: 114
Location: Holland
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 Posted: Sun Apr 19, 2020 5:10 am Post subject: Help on deciding on engine specs |
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Hi,
I recently decided to build my motor to a 2054 with a 74 crank and 94 AA c+p. I now found out someone near me is selling a 78 crank with a leightweight flywheel for €450. What should i do? Rest of the specs will be cb performance panchito heads with titanium retainers, dual springs and snakeskin valves. A compression ratio of 9:1. Deck height 0.040” and combination chamber 60cc. FK8 cam. Was thinking on scat 114.8mm H beam rods. 1:1.25 rockers and maybe a EFI fuel injection system. A magnaspark II ignition system. exhaust wil probably be an CSP super competition without j tubes as I want to keer the heating . Cooling wil be a original gol set. Case will have the hoover mods and full flow done to them for optimal lubrication and cooling. Remote mounted oilcooler. AT trans.
Last edited by MitchS046 on Sun Apr 19, 2020 6:07 am; edited 2 times in total |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7219
Location: Videbaek Denmark
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| Posted: Sun Apr 19, 2020 5:41 am Post subject: Re: Help on deciding on engine specs |
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It depends heavily on both cam and exhaust choice. There is a significant difference on how a 2074 and a 2165 behaves when/if everything else stays the same.
So if cam etc is already chosen we need to know what that is. Also which engine behaviure you want. |
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MitchS046
Samba Member
Joined: March 02, 2020
Posts: 114
Location: Holland
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| Posted: Sun Apr 19, 2020 5:51 am Post subject: Re: Help on deciding on engine specs |
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| Added that i want to use an FK-8 cam and a cup super competition exhaust accidentally forgot it😅 |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7219
Location: Videbaek Denmark
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| Posted: Sun Apr 19, 2020 6:22 am Post subject: Re: Help on deciding on engine specs |
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| MitchS046 wrote: |
| cup super competition exhaust |
eeerhhm, which is that ? CSP super comp EVO, or something else ? |
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MitchS046
Samba Member
Joined: March 02, 2020
Posts: 114
Location: Holland
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| Posted: Sun Apr 19, 2020 6:24 am Post subject: Re: Help on deciding on engine specs |
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| Alstrup wrote: |
| MitchS046 wrote: |
| cup super competition exhaust |
eeerhhm, which is that ? CSP super comp EVO, or something else ? |
sorry had to be an CSP super competition exhaust stupid autocorrect |
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MitchS046
Samba Member
Joined: March 02, 2020
Posts: 114
Location: Holland
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| Posted: Sun Apr 19, 2020 6:25 am Post subject: Re: Help on deciding on engine specs |
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| MitchS046 wrote: |
| Added that i want to use an FK-8 cam and a CSP super competition exhaust accidentally forgot it😅 |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7219
Location: Videbaek Denmark
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| Posted: Sun Apr 19, 2020 6:36 am Post subject: Re: Help on deciding on engine specs |
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With the regular std Super comp definitely stay 2054. - 74 stroke.
With the 42 mm Super comp Evo 2165 is ok |
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