Author Topic: Finally....we are rocking and rolling 😀  (Read 274 times)

AC Ventura

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Finally....we are rocking and rolling 😀
« on: September 12, 2020, 17:07:03 »
Endured 300 miles of wind battering on the M1 motorway today, to visit John Sleath Race Cars in Doncaster, UK. He’s an old school knowledgeable engine guy. Has a good rolling road, but it doesn’t offer so called ‘corrected power’ readings, that is rear wheel data converted to flywheel or Dyno equivalents. He says it’s pointless because losses vary between min 20% and 35% and can’t be reliably ascertained. So all his graphs are at the rear wheels. Anyhow, after an afternoon of timing, distributor weight and jet adjustments we improved the low down running and unplugged the power. The new straight through (loud) glasspack exhaust has also made a big contribution. Final figures show car now produces, at the rear wheels, 412ft lbs and 380bhp, which clearly makes Michigan based engine builder and FE guru Barry Rabotnic’s originally dynoed 503 tq /532 hp beyond doubt and pretty good for an OE bore/non stroker, all aluminium 427. Car drove great and has taken me unawares by the seemingly bottomless acceleration into the 6000rpm area. With the old 302 it was all over by 4000. Anyhow, glad I made sure of a long accelerator travel. 😬 😁 😀 Also 17.3 mpg overall on the journey seems pretty amazing for a 7 litre and car ran faultlessly without any dramas. Taken me 3 years to complete the Autokraft Mk IV small to big block metamorphosis, so looking forward to exploring this fabulous combination 😀

PS The new 1/2” higher Blue Thunder air cleaner element gained us 20hp.

Here we are at a theoretical 156mph
« Last Edit: September 12, 2020, 17:10:26 by AC Ventura »

mjf

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Re: Finally....we are rocking and rolling 😀
« Reply #1 on: September 12, 2020, 20:24:51 »
Is that the end of the road with the upgrades or is there anything else on the list ?

Great job, by the way.

AC Ventura

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Re: Finally....we are rocking and rolling 😀
« Reply #2 on: September 12, 2020, 21:35:01 »
This is the car developed now with no changes envisaged. Exhaust is a bit loud and clutch heavy, but easily manageable. I fortunately got it all right first time, barring the motor fine tuning, which has taken nearly 12 months to understand. I’m pleased I went the more difficult route of staying with the 427 and not the more common 482.
« Last Edit: September 13, 2020, 09:43:26 by AC Ventura »

jmohara

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Re: Finally....we are rocking and rolling 😀
« Reply #3 on: September 13, 2020, 13:27:39 »
Great work.
Can you post some pictures of the engine bay?
Thanks

westcott

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Re: Finally....we are rocking and rolling 😀
« Reply #4 on: September 15, 2020, 07:27:29 »
Enjoy your car as often as possible! Great job!

Do you have Barry's "FE" book in your collection, it is a goog support for all FE drivers ?
Everything should be made as simple as possible, but not simpler!

AC Ventura

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Re: Finally....we are rocking and rolling 😀
« Reply #5 on: September 15, 2020, 23:26:31 »
1000 miles already! Yes Barry’s book was quite useful and sometimes easier to get the information from than the man himself ! However, it’s a little out of date now.
« Last Edit: September 16, 2020, 00:51:33 by AC Ventura »

AC Ventura

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Here is the engine bay
« Reply #6 on: September 15, 2020, 23:34:08 »
Here is the engine bay. It was a huge undertaking to remould the footwells and make everything look like it was done by, or better than the factory. In fact the gap between the footwells is 76mm wider, yet the footwells are spacious enough.
I produced a 45 page illustrated journal, on every step of how I modified this car, in case other owners want to consider the same route. I also produced a one off Workshop Manual, in case I forget myself! You can take the gearbox and clutch out without removing the engine, or you can remove the entire engine in one hour or so.
The gearbox is the T-5’s bigger brother the much stronger TKO 600. It’s much bigger, so the entire transmission tunnel was modified 40mm higher, but you’d never know. 5 speeds give a little more flexibility  compared to the original 4speed Toploader. The first four ratios are almost the same. The fifth you can have progressive (.0.82) or overdrive (0.62). Go for 0.82. You didn’t buy this car to save money on fuel....
Cooling system (original Mk IV radiator) holds a staggering 19 litres and fan is so powerful, it can suck your overalls off the bench!
« Last Edit: September 16, 2020, 09:06:41 by AC Ventura »

AC Ventura

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Re: Finally....we are rocking and rolling 😀
« Reply #7 on: September 15, 2020, 23:40:38 »
The new dash..with full size 16” Mota Lita wheel. Brake reservoirs in new glovebox. Everything to allow air free passage through the engine bay. Finish is non original black crackle, but people think it’s original. I like it and a lot easier than trimming.
The entire dash can be removed, once you have disconnected all the multi connectors.
« Last Edit: September 16, 2020, 00:41:39 by AC Ventura »

AC Ventura

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Re: Finally....we are rocking and rolling 😀
« Reply #8 on: September 15, 2020, 23:48:53 »
Custom headers have huge 1 7/8” dia primaries to help run cool. Everything was optimised I hope. Tuned length not possible, but doesn’t matter...
« Last Edit: September 16, 2020, 00:32:06 by AC Ventura »

AC Ventura

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Re: Finally....we are rocking and rolling 😀
« Reply #9 on: September 15, 2020, 23:53:45 »
I designed and CNC’d my own super secure engine mounts. Todays repro original type engine mounts are poor quality. Some people have had the entire engine rip out and the bonnet with it...
« Last Edit: September 16, 2020, 00:25:10 by AC Ventura »

AC Ventura

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Re: Finally....we are rocking and rolling
« Reply #10 on: September 15, 2020, 23:57:37 »
The engine bay after it was remoulded 76mm wider and the foot boxes shortened 150mm to expose the wing vents. Also the crossmember here is new after the Mk IV one was cut out. Luckily I discovered some genuine Shelby 427 chassis drawings. The Mk IV is comprised mostly the 427 chassis already, but a few mods were required. The big block in a RHD car is much more difficult than LHD, so meticulous planning and engineering are required. The scoop for the exhaust You can see here, I later decided to redo so O could enlarge the footwell. The exhaust now runs in front of the footwell not next to it, where it would get uncomfortably hot.
The original Autokraft engine bay finish was restored, regardless of the effort and complexity. Here I have made the replacement mirror finish bulkhead from scratch as the original one was no longer wide enough.
« Last Edit: September 16, 2020, 09:05:24 by AC Ventura »

AC Ventura

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Re: Finally....we are rocking and rolling 😀
« Reply #11 on: September 16, 2020, 00:08:25 »
Now it’s the aluminium big block car that Shelby and Ken Miles said they always wanted to build. I would have liked to have been able to show them how sweetly it handles with the ultra lightweight engine. I think they would have been as pleased as everything worked out particularly well in the end. I hope I’m not coming across as immodest, but I think it’s simply sensational in every department. It’s far from the disappointment everyone told me to expect. Some old men are not so wise.....😜
« Last Edit: September 16, 2020, 00:53:30 by AC Ventura »

jmohara

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Re: Finally....we are rocking and rolling 😀
« Reply #12 on: September 16, 2020, 20:35:26 »
Amazing pictures - thanks for posting.
You have done a superb job there - you should be very proud of that!