CommodoresPlus

As much as I love pouring over big $$ builds, I have to admit I prefer these ‘nuts and bolts’ builds where the guy gets in there and does it all himself.

It inspires all off us and confirms we can all make our car our own.

Fantastic effort and work mate.  I love it..!!!

+1 for Grant (and Chris).

Grant’s built all my transmissions, converters and even rebuilt my diff center over the last 25 years..

Hell, come to think of it, my first trans was built at his house before he went pro

You’ll fret a little less about denting the extractors after watching this… 

Out of interest , what is the size of each bore on the 1375cfm throttle body?

Out of interest , what is the bore size of the 1375cfm throttle body?

Funny, I was speaking with Craig from Torque Power about this exact thing just the other day.

During some back to back track testing he did exactly what you’re suggesting and disconnected the secondaries in a 1000cfm TB and found the car ran no slower.  His suggestion was to run one of CRD’s 750cfm throttle bodies.

Theoretically a 1375cfm…[Read more]

Let me know if this is still available.

Where do you get these from?

Any fittings will need to be welded on as there’s not enough material in the fuel rail to tap.

By the time you’ve bought the fittings and had the rails modified, it’d be cheaper to use something like this:

http://tinyurl.com/glgvwwv

$160 – cheap and cheerful but quality unknown..

or

http://tinyurl.com/j7k4sv6

$180 – Chinese made but better…[Read more]

Two words: air speed.

Too large a TB will slow air speed and reduce cylinder fill (effectively reducing VE) resulting in less power.

Those calcs above were @ 100% VE.  Things get worse at ‘real world’ VE’s seen on street engines.

The other thing is an engines air requirements versus rpm tend to be fairly linear but airflow versus throttle p…[Read more]

..And there lay another problem – the size of most throttle bodies are 1000cfm and more which is way too big for a 304 or 355.

Even with 100% VE, a 355 turning at 7500 rpm only requires a TB that flows 770cfm.

This reduces air speed and makes less torque in the mid-range.

1000cfm with 100% is nearing 10,000rpm

CRD Engineering make a 750cfm TB…[Read more]

Yes mate, it is mine..

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Cava, sorry mate I wasn’t having a go…  apologies if you took it that way..!!

It’s just that the Harrops don’t tend to suffer the (entire bank) fuel distribution the Edelbrock AG seems to possess.

Milling out that section tends to hurt light throttle response and a bit of torque, so you’d avoid it if at all p…[Read more]

Yes mate, it is mine..

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Cava, sorry mate I wasn’t having a go…  apologies if you took it that way..!!

It’s just that the Harrops don’t tend to suffer the (entire bank) fuel distribution the Edelbrock AG seems to possess.

Milling out that section tends to hurt light throttle response and a bit of t…[Read more]