Brian Damaged
West Midlands
Club Retro Rides Member
Posts: 9,553 
Club RR Member Number: 33
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Compare and contrast two A-Series lumps, both running Arden 8-port alloy heads. One's on 40DCOEs, one is on Lucas fuel injection
1964 Cooper S 1275 on carbs
Cooper S 1293 on fuel injection
Don't they both sound awesome???
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Epic. Downside: neither engine would fit unner the Midas' bonnet. I also smell straight cut drop gears  |
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Apr 15, 2021 16:11:02 GMT
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Ooh, which sounds better, I don't know, my head's gonna blow trying to decide.
😁
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rodharris83
Club Retro Rides Member
Day Dreamer...
Posts: 760
Club RR Member Number: 4
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Apr 15, 2021 16:46:23 GMT
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Absolutely brutal! I love them both....
Carbs just edge it fo me but I guess i'm old school!
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Think they'd both be a danger to small children and animals as they go past!  Carbs (just) for me too. |
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That is a healthy sounding cam in the injected one!
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That is a healthy sounding cam in the injected one! Indeed. Taking advantage of sequential injection, which helps “tame” cams with lots of overlap and extends the workable rev range downwards. The fuel fog produced on both, even at high rpm is quite an eye-opener! Nick |
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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bstardchild
Club Retro Rides Member
Posts: 14,885
Club RR Member Number: 71
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I can't decide which sounds best - so I won't But I do like a side draft  |
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Apr 16, 2021 11:23:16 GMT
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That is a healthy sounding cam in the injected one! Indeed. Taking advantage of sequential injection, which helps “tame” cams with lots of overlap and extends the workable rev range downwards. The fuel fog produced on both, even at high rpm is quite an eye-opener! Nick I too was surprised to see that "fog", I always imagined that the air/fuel flow into the engine was a sort of smooth streamline. However it is obviously more complex with that "Stand - off"....is that in part due to the cam overlap and a standing wave? |
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Apr 16, 2021 12:05:23 GMT
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I too was surprised to see that "fog", I always imagined that the air/fuel flow into the engine was a sort of smooth streamline. However it is obviously more complex with that "Stand - off"....is that in part due to the cam overlap and a standing wave? Yes, I think so, and I have seen seen the standing waves before, but rpm specific and usually fairly low rpm, with them getting nearer the carb throats and disappearing into them as the revs rise and the reversion reduces and stops. Suspect something else is at play here.... also suspect this may be one of the thirstier Minis on the planet! Nick |
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Apr 16, 2021 14:30:33 GMT
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I couldn’t decide if it was fuel fog or a vortex of air rushing in on a cold day condensing?
I’m game to try this on mine once the charger is fitted and running well.
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Midas
Part of things
Posts: 505
Club RR Member Number: 14
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Apr 16, 2021 20:31:56 GMT
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Epic. Downside: neither engine would fit unner the Midas' bonnet. I also smell straight cut drop gears Well, you say that..... tucked away in my lock up is a plug for a Mk3 Midas bonnet that was done for a car with a similar set up. |
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stealthstylz
Club Retro Rides Member
Posts: 14,832
Club RR Member Number: 174
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Apr 16, 2021 21:39:54 GMT
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Carb + lairy cam is always the winner for me sound wise, mainly because of all the drawbacks of using carbs with big cams makes them sound cool even if they're a bit curse word
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Apr 16, 2021 22:42:45 GMT
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Epic. Downside: neither engine would fit unner the Midas' bonnet. I also smell straight cut drop gears Well, you say that..... tucked away in my lock up is a plug for a Mk3 Midas bonnet that was done for a car with a similar set up. Sadly my Mk1 does not leave a lot of room for even a normal 1275. I can't even use an MG Metro style oil cap...  |
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mk2cossie
Club Retro Rides Member
Posts: 2,948
Club RR Member Number: 77
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That is a healthy sounding cam in the injected one! Indeed. Taking advantage of sequential injection, which helps “tame” cams with lots of overlap and extends the workable rev range downwards. The fuel fog produced on both, even at high rpm is quite an eye-opener! Nick I do believe the fuel injected one is on barrel roller throttles, and is mechanical injection instead of electronic injection |
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Apr 17, 2021 15:08:47 GMT
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I was surprised by the fuel fog too. I know Webers do it, because I can see my ones doing it when you flip the revs up. I don’t think I’ve ever seen a view directly down the barrels though and I never realised the flow into them was quite so bad! I guess it’s the resonance in the port ejecting it. Inlet valve closes and the column of gas springs back and shoots it back out. The only real way of capturing it is to either run a very long trumpet or a plenum/airbox like on a Lotus Cortina etc. Otherwise it looks like it just gets wasted!
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Apr 17, 2021 21:39:21 GMT
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I do believe the fuel injected one is on barrel roller throttles, and is mechanical injection instead of electronic injection [/quote] Indeed. But if it’s Lucas injection it will still be sequential. I think most of the mechanical systems are apart from the Bosch CIS/K-Jet? Nick Edit, maybe part of the gig thing is that they have to run short trumpets to fit under the bonnet? |
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Last Edit: Apr 17, 2021 21:41:27 GMT by vitesseefi
1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Apr 18, 2021 16:33:41 GMT
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Indeed. Taking advantage of sequential injection, which helps “tame” cams with lots of overlap and extends the workable rev range downwards. The fuel fog produced on both, even at high rpm is quite an eye-opener! Nick I do believe the fuel injected one is on barrel roller throttles, and is mechanical injection instead of electronic injection I think the fuel injected one is on flat slide throttles - it certainly looks like that. ........and who wouldn't want long trumpets on Webers??  |
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Last Edit: Apr 18, 2021 16:42:41 GMT by flyingphil
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