bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89 
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Post by bn6 on Nov 8, 2017 19:37:40 GMT
What is the ideal diff ratio for the Healey 3000 to use on the road ? how can you tell what ratio of diff is fitted ?
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Post by Admin on Nov 9, 2017 10:22:07 GMT
What is the ideal diff ratio for the Healey 3000 to use on the road ? how can you tell what ratio of diff is fitted ? Ideal for what driving style? Best way is to pull the diff and count the number of teeth on the ring and pinion. Then divide ring teeth by pinion teeth to get ratio. Alternatively, safely jack up rear end and get a helper to turn a rear wheel one revolution while you count the revolutions of the propshaft that you have marked with a datum point. The number of propshaft revs is your diff ration. This is not very accurate. |
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Post by dougie on Nov 9, 2017 20:47:33 GMT
What is the ideal diff ratio for the Healey 3000 to use on the road ? how can you tell what ratio of diff is fitted ? For highway and long touring, 3.54:1 with overdrive seems to be the ideal choice. I've run this in my '65 BJ8 for 20 years and love it. I run 4.8:1 & 3.9:1 in my '57 100-6 vintage racer. |
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bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Nov 10, 2017 15:46:57 GMT
Thanks for the replies, mine is a 100/6 BN6 that I am replacing the original 2.6 engine with a 2.9 Ltr, the original engine is being stored so in the future the car can be put it back to the original configuration should I ever sell it and of course it will have a spare road fast unit available.
The 2.9 is being made into a fast road use engine with upgraded camshaft, balanced, lightened and ported with two SU HD8 carbs and hoping to achieve 160-180 HP. I am looking for a combination of good acceleration whilst keeping a decent top end speed at sensible RPM, the original side change 4 speed gearbox with overdrive will be retained so that only leaves the diff to get a balance.
I don't want to go down the route of triple carbs as I want to keep the aesthetics as near as possible to the original engine.
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Post by josefeckert on Nov 10, 2017 19:52:44 GMT
You loose the aestethics when HD 8 carbs fitted. The HD 8 only gain 5 horsepower maximum compared to well tuned HD 6s. But you need much more stops at petrol stations.
Its not the horsepower, its the engine torque you should look for.
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bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Nov 10, 2017 20:18:32 GMT
You loose the aestethics when HD 8 carbs fitted. The HD 8 only gain 5 horsepower maximum compared to well tuned HD 6s. But you need much more stops at petrol stations. Its not the horsepower, its the engine torque you should look for. True but not as much as having triple carbs on a car that only ever had two carbs, remember I am keeping the original engine should I ever decide to sell it. |
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Post by josefeckert on Nov 10, 2017 20:45:23 GMT
There is no real technical reason to fit HD 8 carbs. All I know who went that way, are after short time back to HD 6s. The fuel consumption raised remarkably without any feelable win in power.
Could it be next on your list are disc front brakes? Then I need to ask you why you haven´t bought a 3000 instead of your 100/6.
Then better change the 100/6 badge on your car to a 3000 one.
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bn6
Junior Member
Once a BT-7 Owner, now a BN6 100/6 Owner
Posts: 89
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Post by bn6 on Nov 10, 2017 20:51:12 GMT
There is no real technical reason to fit HD 8 carbs. All I know who went that way, are after short time back to HD 6s. The fuel consumption raised remarkably without any feelable win in power. Could it be next on your list are disc front brakes? Then I need to ask you why you haven´t bought a 3000 instead of your 100/6. Then better change the 100/6 badge on your car to a 3000 one. I did have a BT7 four seater years ago, but now I have a 2 seater RHD BN6 100/6 which I prefer and is much rarer, however I would like to have more performance from her no different from the early days of the factory tuning them. I don't do concours events or shows I just enjoy the car but like it to look reasonably original. |
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Post by josefeckert on Nov 10, 2017 21:01:04 GMT
When you convert it its no more a rare car. Its like 100Ms. An original early 100 BN1 is muchh rarer than a lookalike 100M or even an original one.
I have an original tricarb 3000 because I wanted one. I am looking for a BN6 because I want a BN6 and not a car which is more a BN7 than a BN6.
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Post by dougie on Nov 11, 2017 5:48:04 GMT
BN6 - It's your car, build it the way you want. Don't listen to all the other noise, DMH wanted people to enjoy their cars. I use my Big Healeys in many ways, street, race, and show. They don't just sit in the garage under a coverage, the more you're behind the wheel, the more you'll love your car. Drive it often!  |
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Post by josefeckert on Nov 11, 2017 20:16:15 GMT
Its already different. So just enjoy your modifications.
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