I couldn't find our discussion about intakes from a while back. I think it may be buried in the many pages of Calvin's 500hp thread.

So, I thought I'd start a new thread where we can put all discussions about intakes, and they will be easy to find with a forum search.

To start the thread off, I thought I'd share these cool long-runner intakes from an Aussie friend's shop. They look a lot like the ones AJ6 Engineering sold many years ago, but, I can't say for certain.

 

Yes, they look very like the ones AJ6 nno longer make but do have a pic of on their site. I want some, who makes them? Did your friend notice a difference?

greg

 

I want to know If these are aj6 intakes aswell.

 

I'm pretty sure that's a customer's car at either his, or, his dad's shop. Or, it could be one of their racers. He shared the pics on Facebook this morning.

 

i just posted on a different thread!

some same pix of the AJ6 inlet system, some pix of a couple types.

cross ram is from Forward engineering,Roger Bywater.

AJ6 plenum sizing is seems to be the prefered setup,instead of open trumpets, but the LIster Storm used a large plenum airbox/ filter setup covering the whole top of engine, i had pix of it at Daytona race 1995-96, but they got deleted on a PC cleanup.

 

couple pix inlet manifold, and dyno tests info.

Chevy 4 cylinder with boost, ECOTEC. hope i dont run into one of those chevy Cobalts.

the manifold design is in another thread by JaZ, but on an XJS V12, follows same engineering,without boost.

this is the new way of racing engines, 122 cu.in. vs 427 cu.in displacment, close to same power levels!

 

No need to worry. The kids never liked the Cobalts, so, it's doubtful that anyone was willing to put that kind of money into one that's driven on the street.

 

Check this out.

My FB friend, is bringing a black monster back to life down in Melbourne.
He had this manifold CNC'd just for this project.

The engine in the photo is just the mock up engine. The intakes are going onto a 7.4L '91 LeMans spec motor.



Here is the car it's going into:

 

Great Googly Moogly! JagZilla, can you keep us posted on the build?

 

He has entered it in the Valvoline Winton 300 in November, so, he hopes to have it ready by then. He, and his dad will be the drivers.

 

Scott:


Any chance you can find out what the runner diameter and runner length are?


I have long been enthused about crisscrossing the runners to get that length. If you can get rid of the dizzy and throttle tower, and then use care to place the injectors and still get access to the plugs (I know, I know), this would give a pretty nice arrangement, with what would likely be a pretty decent bump in the torque curve at much lower rpm levels.


Cool stuff, keep those pix comin'!

 

Mike, I'll see what I can do. You made me wonder how he's going to change plugs with that setup.
Like you, hes a genuine type of guy who enjoys talking Jaguar. He also has a long family history, engineering & racing background with Jags (and Astons) in general, and XJSes in particular, so, he can pretty much make them do anything he wants them to do.

 

Mike,

Here's the conversation:

• Scott
• I've been looking at that wonderful ITB intake setup, and I've shown it to some XJS guys on the web. We're all anxious to know how well it performs.
  One guy wanted me to ask you what the length and diameter is on those runners. My own question to you is: How do you change the spark plugs with this arrangement? I'm also anxious to see more details of your black monster (the condition it's in now, as well as what will be required to bring it back to life).
• J
• Hi Scott, I'm keen to see what it does too.
• J
• The runner diameter is around 40mm and tapers down a few mm at the inlet port side. The length is around 9 inches, however we will add a yet to be determined short length bell mouth. It is anticipated to have a good result for a 6 litre engine, however I'm not sure it would be easily achievable to develop for a 7 or 7.4 litre engine, you would struggle to flow enough air.
• J
• At the moment it will be extremely difficult to change plugs with the system still in place, however we are working on improving that
• Scott
• Thanks. I'll pass that info along to some VERY interested XJS owners. Have a great weekend, and please keep us updated about this project.

 

I've been mulling over attempting to do an itb setup on my build. Might be a lot of pain for what could be marginal gain, but I've always loved the look of them! That set up looks killer. Can't wait to find out how it does.

 

Scott:


Thanks for those details- I was suspicioning 40-42 mm, so this confirms. I will love to see this on a working fitment, to see the injector and plug details.


Cool!


Thanks again!

 

Here are pix of one of the plenums for that crossover intake system I posted last month. Each plenum is made up of three-pieces. Each piece is CNC'd from a solid aluminum billet.

 

Wow! That's beautiful. But what an argument for additive manufacturing!


I would guess that a good panel beater may be able to form the top and bottom sections, too.


-M

 

Mike,

I don't think a panel beater could replicate the insides of these plenums. I gather from Jordan, that there is something special about the ridges and grooves on the inside. I asked if he was going to polish and smooth the inside, and his reply of "I'm going to leave them as they are" had a bit of wry "Trust me. I know what I'm doing here" attitude. Knowing his history with British racing, and performance cars (Astons, as well as Jags), I have to believe him. Also, that CNC machine could have easily smoothed out the insides, but, there is a precise pattern inscribed there, so, he must have inside knowledge of a particular airflow theory which he's counting on to add a few extra ponies.

 

absolutly beautiful, cost is around $100. USD,maybe more?

nobody thought this kind of manufacturing could be done jusy 20yrs ago, cant even guess what the future holds.

and all this stuff started in the fancy US hotrod guys, behold the mighty CNC .

 

true about the internal finish being slightly rough, or machine lines, somthing to to with Laminer flow sience.
less friction drag when flow is raised off the walls, etc.