work on 6.9 re commencing

[motec 6.9]

Hi Guys after almost 6 months away from home with work i am now home so can re commence work on my 6.9 so far have only removed parts that have been sitting in my car from goldie and given her a quick clean have 7 days of next week so will do more work then have to take my time at moment so i dont get in trouble i must say she sounds great with her exhaust at the moment but not able to see it passing rego anyway looking forward to getting stuck into her over next couple of weeks

 

[motec 6.9]

Hi guys just an update now that i am home i have cleaned my car replaced rear tail light seals and rear bumper bar rubber next week i will do the door seals all parts genuinne bought from mbspares in Canberra i have changed and fitted new brake pads and replaced fluid then to get car regoed in next couple of weeks so i can get it repainted being home is making it a lot easier to get things done as to my original motor work completed so far is heads ported and polished and fitted with custom valves with thinner valve stems i have purchased new timming chain and guides the block has been machined and crank has been offset ground complete gasket set has been purchased still need to purchase custom pistons and rods then final assembly which i will chase up soon as i can i have informed work i will not be going away again for a while the saga continues

 

[Styria]

Well Motec, I am certainly hopeful that I'll be seeing your car one day in all its glory. The work you are, or have been undertaking, is quite substantial and very time consuming. Tell me, how is the upholstery and carpets ? With the Australian dollar being at its high level, now is the time to purchase trim from the right sources.

Times are a bit tough for some of us, and therefore I am prepared to offer a genuine 20% discount on all items ordered by myself from GAHH in California. Their quality is beyond question, and the service is excellent. This offer applies to any order received up to the end of the year. Regards Styria

 

[motec 6.9]

Hi Styria as i have told you before i need to redo front seats so i will do rear and carpets while i am at it as i figure if i am painting car i may as well make interior match condition of exterior by the way Styria did you recieve picture of current dyno report though i will admit being somewhat by the power figure after money spent so far the car made over 600lbs of torque for the entire rev range and since being home i have seen david at tr& green and are working towards finding solution it would appear to be airflow is problem

 

[motec 6.9]

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[Styria]

Hi Motec 6.9, I did in fact receive your pictures, but being by way of message on my i-phone, it is not easy to appreciate the full extent of the work that's been carried out on the engine, i.e. inlet manifold etc. etc. I can't be quite certain, but it would appear that you may still have the original hose clips that secure the rubber tubing to the injectors. Am I correct in assuming this ? If so,I would recommend thatyou change them to the type of clip that doesn't cut into the rubber.

Incidentally, one of our members, Dusty Miller in the UK, has rebuilt his 6.9 engine using American after market pistons - obviously, the price of those would be well below what the genuine items would cost from Mercedes. Dusty has bought one of my AMG repro spoilers, and you may perhaps wish to contact him regarding details of the work and cost involved in reconditioning his engine.

As far as upholstery and carpets are concerned, I will get back to you with more details of pricing, cost of freight etc. Once ordered, the goods (as a rule) should take no longer than a week to be at your front door. As advised previously, it is of some importance to keep the value of shipments below $1K. on account of import duty that would otherwise be payable. Good luck with your project - hope you get the air flow problem sorted out...and oh, by the way, DO NOT DISCARD the sound proofing that is glued to the bottom of your original carpet. Regards Styria

 

[BenzBoy]

After-market pistons? Egge Engineering make a range in the USA and also make for other brands to sell under a variety of labels. Regrettably, they can't be recommended.
Regards,
Benz-Boy

 

[Oversize]

600ft/lbs seems like a huge increase in torque considering your airflow problem & its apparent effect on max power. Are you sure it wasn't 600Nm?

 

[motec 6.9]

Yes 600lb is alot but that is what the dyno report says it recorded for the whole rev range as for power the throttle body is the standard 6.9 one just something to keep in mind

 

[Oversize]

I believe the Euro 6.9s originally had up to 550Nm which is the same as the current HSVs.

I'll take a guess that your torque figures were measured at the wheels, whereas I'd say MBs specs were at the flywheel. Am I correct in assuming that the torque converter multiplies the torque produced by the engine, so torque at the engine would actually be lower than torque at the wheels? I do know that power works in reverse & due to driveline losses, power at the wheels is somewhat lower than power at the flywheel.....

If your torque figures are correct 600ft/lbs equates to about 816Nm, so I hope the rest of your driveline's up to the challenge! And I hope you have plenty of $$ for new rear tyres!!

 

[John S]

The engine torque is multiplied by the diff ratio but then reduced by the tyre radius, less all the frictional losses in the system (not much with modern lubricants).

 

[Styria]

Yes 600lb is alot but that is what the dyno report says it recorded for the whole rev range as for power the throttle body is the standard 6.9 one just something to keep in mind

Hi motec 6.9, I am just a bit lost with the whole shebang, so to speak. I know you previously referred to air flow restrictions created by the small size of the 6.9 throttle body, incidentally the same size as on a 450, or a 3.6 litre Holden Commodore. I believe you were going to investigate the possibility of having some items, such as Inlet Manifold etc. remanufactured - have you had this done yet ?

SELfour50 has also done a lot of work on his engine, and I believe his horse power figure (at the back wheel) was somewhere near 215bhp, which was a lot more than one or two others have achieved - their figures were down to somewhere around the 180bhp mark - do you know what sort of horse power you have at the back wheels on your car ? Regards Styria

 

[motec 6.9]

Hi Styria my car has made 215 at the rear wheels i have not done anything to my other inlet manifold at this point in time working out what to do next if you could post dyno report it would be apreciated or if Cam could do so he has a copie as well

 

[motec 6.9]

Hi guys just in case anyone is interested i refitted my oznos kit to my 6.9 on the weekend i will get around to doing a dyno run with the NOS at some point in time it is currently 150hp but it is a fogger kit that can go to 300hp last time on the car i was in the low 13s so it should be interesting i am working on fitting 100mm throttle body to my spare manifold at the moment so once i have fitted that manifold and my ported heads i will have car re dyno tunned and see what improvements it has made plus i will do a NOS run just in the interest of science you understand

 

[SELfor50]

Hi guys just in case anyone is interested i refitted my oznos kit to my 6.9 on the weekend i will get around to doing a dyno run with the NOS at some point in time it is currently 150hp but it is a fogger kit that can go to 300hp last time on the car i was in the low 13s so it should be interesting i am working on fitting 100mm throttle body to my spare manifold at the moment so once i have fitted that manifold and my ported heads i will have car re dyno tunned and see what improvements it has made plus i will do a NOS run just in the interest of science you understand

Bloody ripper.

I'm going to see Greg today and will discuss exactly where we're heading with the manifold.
What TB are you going to fit?? LS1? I've been told that's best cause it's still mechanical operation, not fly by wire.

Thank god for people like you willing to do research in the name of science.


You going to fit the heads to your current engine or wait till the big daddy engine is done? I wouldn't wanna spend so much on the gaskets!

 

[SELfor50]

Also.. quick questions.

Fuel pump(s).

What fuel pump(s) are you running? Are the benz pumps pretty much identical to the 044 Bosch motorsport pumps? I know the benz bosch pumps give good pressure.. would 2 of them be enough for EFI / Forced Induction setup??

 

[motec 6.9]

Yes Cam the 6.9 pump is the big Bosch pump and it can flow enough for 600hp just be aware to isolate it when fitting extra pump as it is a loud pump i have decided to avoid the problems i had last time with NOS by fitting seperate fuel line and pump for NOS i have fitted holley blue pump flows 11lb of fuel pressure thriugh 1/2 inch fuel line and go's into A1 fuel regulator with 7 outlets set at 7.5 lbs pressure before returning to the fuel tank as i said before NOS must remain above 7lbs fuel pressure to keep your motor safe the holley pump is armed by isolator switch so this time i will not have lean out problems plus the NOS is set to turn off if pressure drops to 7lbs as last time it killed my motor i am tempted to fit my heads to current motor but i think i will wait till good motor is finnished

 

[Oversize]

Hi Motec, what damage was done to your engine when you suffered the lean out? Did you take any pictures?

What pistons will you be running in the new engine & have you upgraded the valve springs? Will you be using the original cams?

 

[motec 6.9]

Hi Mark i burnt a couple off valves both intake and exhaust i then let it sit for 5 years with no interest and played with a black vy one tonner v8 6 speed that i supercharged sold to buy SY Territory Ghia AWD then played with AU11 XR8 220kw now back riding a bike 2008 Suzuki Hyabusa

 

[Styria]

Hi Mark i burnt a couple off valves both intake and exhaust i then let it sit for 5 years with no interest and played with a black vy one tonner v8 6 speed that i supercharged sold to buy SY Territory Ghia AWD then played with AU11 XR8 220kw now back riding a bike 2008 Suzuki Hyabusa

Motec6.9, love those Hyabusas - unless I am mistaken, first production bike to comfortably exceed 300 km/hr in standard guise. Even the sound is great with the INCORRECT exhaust. Regards Styria