Doing some work on my LT5

[Toranamat69]

Hi Guys,

Thought I would show a little of the work I have been doing recently.
I got the Throttle body taken out to 63mm by Greg Van deventer and Corey Henderson did the injector housings and plenum.

I thought I would go crazy and polish the outside and remove any unneccessary casting bumps etc.

I couldn't help myself and had to spend a few hours on the insides as well.

[Toranamat69]

A few more

[Toranamat69]

and a few more.

For a bit of a description - go to the bottom of this page.

http://www.cardomain.com/ride/480776

Matt

[Toranamat69]

The coolant pipes already done.

[HAWAIIZR-1]

Love it. Awesome job and thanks for sharing!!! :cheers:

[-=Jeff=-]

The coolant pipes already done.


did you add those extra tabs towards the round pen end of the Coolant Tube?

neither set I have have those

[Toranamat69]

Jeff, mine had similar ones on there that bolted to the same place and looked really ordinary so I chopped them off and made some nice smooth ones and had them welded on.

It was only after I polished them, I looked at heaps of pics on the net and it doesn't look like any of them have them - I assumed everyone must just chop them off as they were pretty flimsy.

I could chop them back off, but I'll see how they look when the engine is re-assembled. They do look like they serve a purpose but not essential?

Mine don't have those other bosses back on the main rectangular bit that bolt to the inj housing either. Maybe because it was a late pre production prototype engine as best I can work out.

[carter200]

did you add those extra tabs towards the round pen end of the Coolant Tube?

neither set I have have those

Never seen those tabs on all the sets I've engraved.............

PS: these are good candidates for engraving by CT Machining. PM me for info or ask someone to post a pic of their coolant pipes that I have engraved.......

[ZZZZZR1]

Matt

Thanks for posting!!!!


Could we get some more "Porn"? (ie pictures of your ZR-1???)


:cheers:


David

[Pete]

Matt

Thanks for posting!!!!


Could we get some more "Porn"? (ie pictures of your ZR-1???)


:cheers:


David


Dave,it's not a ZR-1
He has put an LT5 in an old Holden car,pretty cool.
Go to his web site. http://www.cardomain.com/ride/480776

What got me from his web site,was this.

"The best part is the tail pipes saved me another 9kg and the increase in power is very noticeable.
All the bends in the tailpipe and in particular the nasty 3" to 2.5" reducer must have been costing me significant horsepower (http://www.cardomain.com/ride/480776#). The driveability at very low speeds has also improved to my surprise as it was damn good to start with and now it is even better. Don't you love free upgrades :-)) "

You read where he says "very noticeable" and "costing me significant horsepower"
All i will say is if you can feel HP should be pretty much.
Pete

[A26B]

The coolant pipe tabs are prototype, not sure what vintage, but pre-89.

[ZZZZZR1]

WOW

Now that is PORN!!!!!!!!!!! I want more!

=D>

David

[tomtom72]

all I can say is "you do nice work!" :cheers:

You can shave in your finish! Sweet man!

[Toranamat69]

Thanks for the comments, I will certainly post more pics as I go.

The date stamp on my block and crank case is April '89.

My engine number stamping seems a little odd but I have established it is a very late preproduction prototype and is pretty much 89/90 spec with a few minor differences like mounting tabs on pipes etc.

I have plenty of other good bits to go on this time such as Fidanza flywheel, new leads, coils and injectors, ATI balancer - all the normal ZR1 stuff.

Matt

[Toranamat69]

I will have a few more progress pics this weekend, I have done about another 5 or 6 hours this week.

I am going to weld up the holes in the plenum where the coolant lines to the throttle body join up rather than tapping them and plugging them. This means I can grind out all the internal casting for the cooland inside the plenum just inside where the throttle body bolts to.

Has anyone done this and was there any advantage? It does seem to close up the intake at least a little.

Also - what is the best shape to make the transition from the front face of the plenum where it opens out into the main plenum chamber?
There is about 6mm of alloy thickness that could be used to taper or bellmouth slightly into the plenum.
Anyone got any experience with this?

Matt

[FU]

WOW

Now that is PORN!!!!!!!!!!! I want more!

=D>

David

Yo David........put your dinky back in it's holster boy ! That isn't porn !

[Toranamat69]

G'day Again guys,

Got a few more pics - this stage takes ages so I will just keep chipping away an hour after work each day.

Here is the injector housings in progress. one is about half done in 80 grit - the other is almost ready to start with the 80 grit.

[Toranamat69]

The plenum with the EGR boss filed off.

[Toranamat69]

Back to my question from last week, what do others do with the shape of the plenum where I have drawn the red arrows below? Is it best to leave these circular from the front face right through to where it opens out into inside the plenum, or is it better to taper it out or bellmouth the opening??

Also, what about the casting for throttle body coolant and EGR bolt (in red circle and 2 red ellipses in the other picture). Is it worth removing these? It looks to me like they would be causing a restriction to the front cylinder - especially on one side.

Any feedback would be helpful.

Matt