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Jun 14th, 2026
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Joined: Jul 2015
Posts: 38
Just Getting Started
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OP
Just Getting Started
Joined: Jul 2015
Posts: 38 |
having built a 128CI motor, there is extra power in the extra CI's (cams/58mm throttle body/roller rockers) but what you should do first that makes a real difference is to open the exhaust up, upgrade the air cleaner and replace the ECU with an S&S running file as the lock up Morgan ECU/File detunes the engine. Have you had it dyno tested? What are the hp/torque gains for each stage?
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Joined: Jul 2015
Posts: 38
Just Getting Started
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OP
Just Getting Started
Joined: Jul 2015
Posts: 38 |
having built a 128CI motor, there is extra power in the extra CI's (cams/58mm throttle body/roller rockers) but what you should do first that makes a real difference is to open the exhaust up, upgrade the air cleaner and replace the ECU with an S&S running file as the lock up Morgan ECU/File detunes the engine. Also, what's your new top speed?
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Joined: Feb 2016
Posts: 306
Learner Plates Off!
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Learner Plates Off!
Joined: Feb 2016
Posts: 306 |
Also, what's your new top speed? I'd imagine negligible difference there. Changing the motor doesn't change the transmission or bevel box gearing. It would just be quicker to get to speed, unless he did something to get it up to a decent higher rev range, which I don't imagine is the case.
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Joined: Jan 2014
Posts: 462
Learner Plates Off!
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Learner Plates Off!
Joined: Jan 2014
Posts: 462 |
Just the seat of my pants dyno so far!
I'm not interested in speed over 90mph with a wheel missing ;-)
JV Sclafani
Boca Raton, FL
'13 M3W Metallic Orange Pearl
128CI Steered by Empire - Riding on Ohlins
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Joined: Jul 2015
Posts: 38
Just Getting Started
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OP
Just Getting Started
Joined: Jul 2015
Posts: 38 |
I'm looking to get the top speed up to 160 or so. From what I can tell the Miata transmission can go up that high, but the bevel box may need some tuning and/or replacing
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Joined: Jul 2015
Posts: 2,539
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jul 2015
Posts: 2,539 |
It would do that, off of a cliff....
kirkusblog.com
2016 M3W John A Prestwich Special
1952 Ford 8N
1968 Honda CL175,and 2018 Ural Retro
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Joined: Jan 2014
Posts: 462
Learner Plates Off!
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Learner Plates Off!
Joined: Jan 2014
Posts: 462 |
160 kilometers not 160 mph right?
160 mph would scare the crap out of me!
160 kilometers is 99 miles per hour which is easily possible with a stock machine.
to hit 160 mph you really will need the higher revs so the roller rockers kit could help will that.
Last edited by JVS; 30/11/16 08:27 PM.
JV Sclafani
Boca Raton, FL
'13 M3W Metallic Orange Pearl
128CI Steered by Empire - Riding on Ohlins
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Joined: Oct 2016
Posts: 1,544 Likes: 1
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Oct 2016
Posts: 1,544 Likes: 1 |
Bet the ol bevel box be howling at that speed!! Done 115mph indicated was ok! Recon 125mph about as fast as i want to go. Properly (always room for change when behind the wheel !  )
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Joined: Apr 2014
Posts: 5,182 Likes: 2
Charter Member
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Charter Member
Joined: Apr 2014
Posts: 5,182 Likes: 2 |
And i thought i was a hero at 70mph on a test drive.
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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Joined: May 2012
Posts: 1,796 Likes: 5
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2012
Posts: 1,796 Likes: 5 |
110mph easily achievable but wouldn't want to go any quicker without stabilisers!!!
I would just like to get there quicker now and again especially running 2 up as that dents the performance no end.
BTW cheapest performance upgrade, I lost 2 stone (28 pounds) for the US readers.
It now accelerates and brakes quicker.
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