1969 SE5 Alfa V6 conversion: Lowering the Throne.

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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by philhoward » Wed Jan 18, 2017 10:54 am

They generally whine and clunk a bit with age but t rarely give up completely unless run dry.

They have been known to go in competition but that's down to tyre warming with sticky tyres or a full throttle launch in 1st gear.


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by Nick » Wed Jan 18, 2017 11:55 am

If you have checked tho propshaft deffo worth checking the oil in Diff and gearbox. Do you have overdrive?


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by philhoward » Wed Jan 18, 2017 11:57 am

It's not the original box, Nick ;)


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by Nick » Wed Jan 18, 2017 11:59 am

Of course, just thought of that!


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by fightingtorque » Fri Jan 20, 2017 5:11 pm

Not had a chance to investigate the axle problem yet but in the meantime this arrived:

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This is a 3.0 version of the same engine, I believe they are rated at about 230bhp so with the right exhausts, mapping, intake etc I might see 230-250 if I just put it in. What I intend to do is to first build up a complete powertrain assembly similar to what I have now but maybe with some improvements, possibly also rebuild the engine and tune it a bit further. Then decide whether to put it in the Scimitar or something else......



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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by fightingtorque » Tue Jan 24, 2017 9:15 pm

Drained the oil from the diff. Plenty of oil but also a certain amount of steel shrapnel came out with it.....



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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by philhoward » Tue Jan 24, 2017 10:30 pm

Oil - good.

Extraneous metallic bits - not good :(


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by scimjim » Tue Jan 24, 2017 10:31 pm

Time for an LSD then :D


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by fightingtorque » Thu Jan 26, 2017 6:44 pm

So a combination of the facebook RSSOC page and then searching scimitarweb turned up something I didn't know. All through the build my mate Angry Dave has been questioning the sense of this, mainly with " are you SURE it isn't just going to rip the back axle off ? " and I've been explaining that the Scimitar is famous for having an indestructible 4HA axle.....

..... but mine is one of the first 500 cars with a 7HA axle. Now you'd think if 4HA was good, 7HA would be even better but this does not appear to be the case.

Fortunately also through the FB page I got connected to an oval track racing guy who had a couple of Scimitar axles surplus, and so I nipped over there and now I have a new axle. Think I will change the seals at least before putting it on the car. An LSD would be nice but it seems the choice is either >1k for a new quaiffe, gripper etc., or 500 for a secondhand Jag unit. I will do this at some point but I think a new set of shock/spring units and a front brake conversion would be better use of the money. Along with various other financial pulls from other vehicles.......

Gav



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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by Roger Pennington » Thu Jan 26, 2017 6:52 pm

Ah yes, in my earlier comments I had assumed you had a 4HA - if it's a 7HA then that makes a big difference. It's a much lighter weight unit :wink: (and I don't understand how their numbering system works either..... :lol: )


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Re: 1969 SE5 Alfa V6 conversion:I've busted something!

Post by MikeyBikey » Thu Jan 26, 2017 7:10 pm

fightingtorque wrote: I will do this at some point but I think a new set of shock/spring units and a front brake conversion would be better use of the money. Along with various other financial pulls from other vehicles.......

Gav

Hi Gav

Protech shocks & springs - very good and reasonable - used by a lot of compies
re brakes I fitted wilwoods and vented but jury is still out on that. Dont have a servo at the moment, might try a new inline one i have sat waiting on the shelf...


Is we sideways yet...

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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by roymck » Fri Jan 27, 2017 8:47 am

Gavin didn't realise it was you posting on Facebook looking for an axle , with that amount of power through a 7HA axle no wonder it didn't last long , don't forget the propshaft is a different length.



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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by fightingtorque » Fri Jan 27, 2017 9:15 am

no wonder it didn't last long
One trackday and about 500 road miles!
don't forget the propshaft is a different length.
This is the annoying bit. If I would have realised I didn't have the right axle in the beginning, I would have changed it when I did the conversion. I am not sure how much the difference in length is but I could maybe have accommodated the difference by moving the engine slightly further back. And I would have had a working 7HA axle that maybe would have been useful to someone.

On the plus side I was only a mile or so from home when it broke so it could have been much more annoying.



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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by turbster » Fri Jan 27, 2017 10:49 am

This sounds more like it was on it's last legs and the extra power and a little abuse sorted it out?

Where's the info to suggest it's not strong enough, does anyone stating this as fact have the torque figures for the 7HA with open and LSD diffs?

Lots of competition Coupe and Sabres still run the 7HA axle with heavily modified engines.. A worn out axle, be it 4 or 7HA will obviously fail quicker with track use and increased power?

I'll be putting 360hp and probably 300lb/ft through a 7HA LSD axle which has done a few years service in a modified sprint car already, I'm hoping the figures people are using to come to these conclusions are favourable :lol:


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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by Roger Pennington » Fri Jan 27, 2017 11:23 am

Paul, my note, as you will have seen, didn't mention absolute power handling figures (do such figures actually exist?). The point was a general, relative, one - I doubt that there are many people who would disagree that "the 4HA is a more robust axle than the 7HA". :)


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