the last engine

[Scando]

Anyone building a hot tarmac rally Z? 

[peter mc]

to be honest i think 350 hp will do just nice with so much torque the zed will be very fast and be able to fill up at any gas  station 

[custommade]

Anyone building a hot tarmac rally Z? 

 

[d3c0y]

Hopefully at the end of the year we wil see how close this one can get to 400hp yet.

[custommade]

hey decoy pm'd you

[peter mc]

just a small up date for Jake

well the head is of and i have made some cooling mods. And made some changes to the valve seats and we have lifted the comp to 11. from 10.3  ,,, so stay tuned we will be back on the dyno see if we can get more from the 3.3  . ;;

BTW its making 106 hp per L now  348hp at 7000rpm 

[Gordo]

I thought it was done and dusted heading north for Jake to fit into his zed, have I missed something . There is obviously more to come. Go for more power I say. Good Luck boys.

[peter mc]

well Jake has let me play with his motor ,, at my expense ,  i am just trying to see how much i can find , and get the tune where it needs to be , id like to see 300 ft lbs and  365hp   

[Gordo]

I'm sure you will find it, it's in there somewhere , just got to get it out.

[peter mc]

hay Gordo

can i try your pipes  on the dyno i think they would work well on this motor

[Roberto]

Is it going to run on pump fuel at 11 to 1?

[peter mc]

that it is roberto , i can run 11 with this combo as the head has a great chamber . And the cam we have lets us run more

[d3c0y]

Gordon do you have 48mm runners on your headers?

[dat2kman]

Gordo's pipes?

Similar to the 6 into 1's that Stew Wilkins used to get made?

Now NLA

That mob in Nippon is doing those thumper 48 mm DRAG pipes!, with proper collectors!

 

There is a little something you could try in the head between the valves, a sort of shallow channel, to help "push" flame front, to more fully over piston top, i would have to hunt for the pic of mine.

BTW what do the piston tops look like on head off??? Even burn all over???

[peter mc]

it has a very nice even cover off carbon , all but no 5 that's what I'm working on i hope to get all cylinders even ,

that no 5 cylinder runs lots hotter at this hp level , but I'm all over it 

[gav240z]

A true perfectionist Peter, anxious to see how far you can take this motor.

[peter mc]

we made some big pipes for Jake's beast 13/4 primary pipe 21/4 secondary  we will have it on the dyno this week

[luvemfast]

Look pretty good to me, kind of like my pipes 

[d3c0y]

I think they look pretty darn awesome and always go before show! After they are HPC'd, have a heat shield over the top and put it the car, no one is even going to be getting that close to them so who cares?

48mm primaries must be frigging insanely huge, again i'm getting a bit more perspective on what we talk about on the phone regarding 6-1s and sill drag headers.

[handsandwhich]

I reckon they are pretty good for someone who doesn't weld/fabricate for a living. It's nice to be able to do things when you need them done and not have to rely on others to do it for you.

 

Wish I could have built my own motor instead of farming it out to some jack of all trades know it all. <---- That's a joke BTW..... sort of.

[dat2kman]

Pete, when you run this up, have a play with continuing the two secondaries at the flange, into say, two long pipes say 1400 mm long, before they merge into a single 2.5" tailpipe, then progressively shorten the extended twin secondaries by say 150 mm a time, on each dyno pull.

Watch the change in torque, you'll hit a "sweet" spot, then it will drop away.

 

You know what it pulled rpm wise at peak torque before, run the comparisons!

Keep the info to just you and Les, but I reckon Les will know already!!!

 

BTW you two coming to Eden for the Bega Rally? I'm taking the Y to have a gentle rip on "those" roads!!

[peter mc]

your on the ball mate i have made adj sec pipes and that's the plan its the only way to get it right

and i hope to get up there for the rally should be fun

[Gordo]

PM sent.

[C.A.R.]

Thread has been cleaned up - no more negative comments from anyone, unless you want to be given a holiday...

If you wish to discuss this build in a negative way, PM the owner and/or builder.

 

Capish?

 

[nizm0zed]

Absolutely stunning build, pete, for what its worth i think that exhaust is excellent.

i'd happily pay good money for that, and thats saying something because im a bit of a tightarse

 

I notice that you have the breather for the crankcase blocked off with a welsh plug.

How do you find that affects the engine overall?

I realise that if there is blowby past the piston rings it indicates a problem that needs to be addressed anyway, but i would think that the single breather in the rocker cover, and the associated 'vent/drain' hole in the head would be a bit on the small side once the engine was singing up near full power?

Do you anticipate extra 'emissions' from using one breather? or is it in the grand scheme of things sufficient to work with what will be produced during normal running conditions?

(do you plan to plumb it into the inlet? or vent to atmo? i would assume atmo.)