Technical Tips > Post 84

AIR Pump prototype(s)

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77CVT:
Towing with the likes of mobi tow etc is ok but be careful putting on and off.  Flat bed is preferred.

Car is going well and more HP is only a matter of time!  :22

david_moore:
Minor set back with the new paint and the reassembly process is a little difficult 'cause I bought the car in pieces, other than that it is all going pretty good, need 4 tyres , got a shock at the cost of them. How is it going with the free wheelin' air pump , any luck yet?

Stingraynut:
I've spoken to the Cairns engineer today and he's made a new shaft which goes through the pulley and has a retaining bolt through the centre. (and new bearing) - looks like the bearing got full of locktight but can't see much point in having a go at the brisbane firm, it was a $180 job but I've also spent about $40 on postage and another $40 on a sepentine belt.
 
BTW the bearings were at least twice as big as the originals, sealed etc. The shaft through the gutted pump is almost an inch thick.

Tyres - go to www.tirerack.com - the most favoured 'tire' for the C4 is the Goodyear GS D3 very cheap in US. Unavailable here, I've had Goodyear trying to import some for me for months.

Kumho's are Aus$350 each here but it's not the Ecsta MX that everyone reckons are good. I would happily go into importing some Goodyears if we got up an order that would share the freight/Duty/Insurance  etc - if a few of us did it , it would be worth it.

If you are still putting your car together and haven't driven it then let me tell you that they don't hold the road in the wet, check my other threads out where people mention 'idling' around a race track corner in the wet while ricers fly past.

We don't want that.

S'nut

smacko:
As some of you MAY know; and Stingraynut CERTAINLY DOES-I'm the guy who had the first prototype done (The unfolding dramas can be found somewhere on Corvette forum) and originally recommended the engineer to Stingraynut...(SORRY AGAIN MATE!)

In brief-With version THREE (Totalling FIVE attempts to get it right between stingraynut's and mine) now being PROVEN to be no good (Drew a felt-pen line across entire rear section) found shaft spins WITHIN inner bearing, even by hand and now sounds like a rusty gate!

JOH has said NO to refund.
I went to these guys because a few years back they DID do a great job in machining a cyl head off a Honda m/bike I rebuilt, but our recent experiances have proven that it was the machine, not the 'engineer' that was good!

Finally, now I'm having a real engineer from our club (Kieth Miller - KR Engineering) build me an 'eliminator', (that most guys in the states do when their pump starts wearing) out of stainless steel!

On of the guys on CF came up with what is NOW an obvious solution for anyone going down our path; have the shaft SOLIDLY mounted within case and just put a pulley on front of it, with its own bearing!  SIMPLE - something an engineer SHOULD have thought of before 'laymen' did !

Here's (Hopefully) a pic of prototype FIVE's rear with line proving it isn't done right!

Stingraynut:
Damm you, smacko !








on second thoughts, I'll take that back, much more use sending it this way -

Damm you JOH engineering !


It's not your fault smacko, recommendation is usually the best way to go and you were sure they were good or you wouldn't have had yours done at the same time. No probs.

Here's the link on Corvette Forum
 "http://forums.corvetteforum.com/zerothread?&id=692354&postid=1545798481#1545798481"  - for anyone that is tired of the daytime TV soaps and wants a Corvette story line instead

S'nut

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