Pwr Steer pump - TB42 vs 304

[Sandy Rut]

Bought a calais yesterday with a 304 I want to chuck into my gq.
I see Marks make an adapter to use a TB42 pump instead of the 304 stocker.
I assume it is to overcome a prob of some sort?
Or not?

So will the factory 304 pump enable me to happily turn corners all day (GU steer box and PWR cooler)?

Yes I realise I will need to get custom lines made up.

[1MadEngineer]

the holden SAGINAW is the preferred pump by most!! better flow and pressure in standard form, and very easy to modify!!

[Sandy Rut]

ahh ok. Any idea what models the saginaw came on?
When you say modify do you mean modify to fit or modify to increase performance/ durability or something?

thanks (Im sure its obvious that I know nothing about hydraulics)

[Draven]

I 'think' thats just the old school 'pear' shaped pump. I had mine modded by Yuri before sticking it back in the car...worked a treat.

[Sandy Rut]

I 'think' thats just the old school 'pear' shaped pump.

you mean the saginaw is the pear shaped pump (has integral reservoir)?

I had mine modded by Yuri before sticking it back in the car...worked a treat.

When you say modded do you mean modify to fit or modify to increase performance/ durability or something?

the saginaws maybe higher output but is that a good thing - are the gu boxes then vulnerable to popping seals or something? Is higher output overall or just at idle?

thanks I appreciate all discussion on this

[Draven]

yes, i beleive the saginaw is the pear shaped PS pump. Yuri reco'd the pump and then increased the output pressure for me, its had no ill effect on the PS box at current.

I did ask Yuri why this kind of pump was prefered, and he did explain it to me, but that was a fair while ago. Basicly he said that the Holden pump had less 'seal surface area' or something, so there less seal for pressure to push through.

Im not sure im explaining right..might be worth a call to him... hes was very helpful to me and took the time out to explain things.

[Sandy Rut]

ok so if anyone cares- (from gregory manuals)

tb42 pump puts out 8630-9219kPa at idle
Saginaw as found on VN-VP v8's (+ more??) puts out 9300-10000kPa at idle

so i guess the numbers say saginaw is better than tb42 at turning lock to lock with big tyres at low psi then.

i suspect people buy the Marks adapter to use a tb42 pump on the holden v8 so they dont need to get new custom lines made up???
I would have thought new lines would be a cheaper option than the $$$$ adapter plate???

[chimpboy]

New hoses couldn't possibly set you back more than a hundred bucks or so, using your existing commo and nissan fittings as required. And then you have new hoses.

[GRPABT1]

The 304 pumps work fine (in a holden anyway) but they are notorious for leaking throughout the whole system.

[smurf]

The main reason for puting the Marks adaptor on ,is because on some coversions the holden pump hits the steering box, as mine did, to get new hose made to suit the holden is about a couple hundred bucks, the only problem with puting the Marks adaptor on is trying to figure out how to do the air clean ,at the moment I've got a pod on for now

[Sandy Rut]

The main reason for puting the Marks adaptor on ,is because on some coversions the holden pump hits the steering box

Ahh righto good info thanks.

[paul44b]

I used the standard 4.2 petrol p/s pump and made my own bracket and put it on the drivers side, piece of p, use the standard hoses also...Paul

[xaymaca]

Just digging up this old fella! Can anyone tell me what size fitting is on the saginaw pump? Just so I can take my hose to Pirtek/Enzed and get them to chuck a new fitting on it!

[kegz]

on this topic does anyone have a photo of their inteke setup with the marks adapter brackets and tb42 pump

also does anyone have a tb42 p/s pump thyed like to sell or trade with me i have a td42 pump that has the fittings on the wrong side thanks