Raby Engine Development Sales and Technical Support

View F. A. Q. Section
View F. A. Q. Section

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Frequently Asked Questions

What services does Flat 6 Innovations offer?

Flat 6 Innovations offers turnkey complete upgraded engines for all six cylinder Porsche sports cars. We also offer preventative maintenance services, like IMS Solution retrofits. We also offer in-depth internal engine repairs.

Does Flat 6 Innovations offer full service engine rebuild/ reconstruction to include extraction and installation?

Yes, we prefer to receive full vehicles, extract the engine, and then reinstall it, then test it to perfection, following with a dyno session.

Does Flat 6 Innovations accept “engines only” without vehicles?

Yes, we have programs to support engines only. These are normally reserved for international purchasers, or those far, far away.

Are cars stored indoors while at Flat 6 Innovations?

Yes, vehicles are stored indoors at all times.

How long will my car be at Flat 6 Innovations?

If you opt for as Stocker, or Stage 1, the car may only be here for 3 weeks, if the engine that you ordered is in stock. Vehicles to be fitted with Stage II, Stage II Plus, or Stage III engines will remain on- site for 3.5 months.

Does Flat 6 Innovations offer individual components/ parts sales?

No, Flat 6 Innovations does not sell any individual components. All we have to sell are our engine packages, which are damn good.

How long does the typical order for an engine take to be filled?

This is dependent upon the time of year the engine is ordered. We work to keep our “Stocker” engines, and some Stage 1 engines in stock for immediate delivery. Stage II, Stage II Plus, and Stage III Engines can take up to 1 year to complete, due to backlog, and the time required to create them.

Does Flat 6 Innovations offer brake, suspension, or other vehicle upgrades?

No, we are not a one- stop shop. We don’t believe anyone that works with engines at our level should be. 100% of our focus is dedicated to internal engine endeavors, development, and building the best engine possible.

Does Flat 6 Innovations offer machine work for engines to the public?

No, 100% of our machine shop capability is dedicated to our engine program.

Can l email Flat 6 Innovations for free technical consultations?

No. While we do offer technical consultations, and even online, and hands- on classes, these are not offered for free. Any technical consultation charges are refunded in, full if a paying customer for technical consultation buys an engine from our company. This does not include class attendees.

Can l visit Flat 6 Innovations?

Yes, with some conditions. We are a small, dedicated facility, and we don’t have time for tours unless someone is genuinely interested in purchasing one of our engines. Ultimately its best if a visitor is ready to make a commitment to purchase our engine during their visit. We welcome tours by those who have their engines in process here, and we can schedule these tours months in advance.

General Technical Q&A

What is a normal temperature range for a Type IV engine?

Generally head temps are desirable below 365°F. I like heads to run 265°F-365°F as a norm. 375°F -395°F is getting warm, with 405°F being too hot for any sustained period of time. Oil temps should run 180°F-220°F, as an optimum. 225°F-235°F is warm and 235°F+ is hot and should see some attention.

Where should I mount a Cylinder head temperature sender?

Under the spark plug of at least one cylinder! I have just completed testing and found that the stock position for the EFI sensor (found on TIV engines) can be up to 180°F degrees LOW for a cylinder head temp gauge. This was not its purpose from the factory.

Why can my oil temperatures be hot, but the cylinder heads run cool?

Gearing and ambient temps play a key role in the oil cooling of the engine. Higher revs make for more friction and the oil must work hard to absorb that heat and then dissipate it. Gearing that does not match a Type IV engines powerband is the #1 cause for overheated oil.

Why do my cylinder heads run hot, but not the oil?

Head temperatures are directly related to load. An increased load and decreased RPM result in higher head temps, as the engine is creating heat but it cannot be cooled, due to low fan RPM. Too high of gearing can cause death to head temperatures, especially in high demand applications. The other key factor to engine temps is tuning, an out of tune engine, gets hot fast…Invest in dynamometer tuning, its like gold!

DTM Cooling Systems

How easy does it install?

No, Flat 6 Innovations does not sell any individual components. All we have to sell are our engine packages, which are damn good.

What color does it come in?

The DTM is the easiest and fastest way to convert your engine in the world! There is no kit that provides the cooling that the DTM does and is as user friendly. I have been using DTMs for years and have become totally infatuated with its ease of installation compared to every other kit on the market.

Does it have a thermostat?

No it does not incorporate a thermostat. We have found that in the winter months simply swapping to an earlier type of cooling fan (say from a 13-1500cc engine) will provide excellent warm up, even in cold climates. The addition of an oil thermostat is a plus, but is not needed.

Do I need to cut my car for it to fit?

It is VERY, VERY rare to ever need to cut a vehicle for an install of a DTM.

What core engine is best?

It doesn’t matter, all Type IV engines are strong, and great for conversion. I personally prefer a 1.8L core engine.

Will the TIV engine fit into my current transaxle?

If you have ANY VW Type I / Type II gearbox or Porsche 901/915 gearbox, we can set you up with a no guesswork interchange. The Type IV slides right in. See our fitting pages for more details for your application.

What cylinder heads will it work with?

Any Type IV cylinder head, of any year or engine size, from 1.7-2.0 and even the 2.0 Porsche original heads. It will also work with Scat SplitPort heads, and a few of the aftermarket heads that are on the market.

What engines/cases will the MassIVe DTM fit?

The DTM will fit any engine with an open breather chimney. This includes any W,CB,CD,EA,EC,ED,GA,GC,GD, and GE cases. Basically any 1700-200CC engine. In other words unless your engine came from any vehicle other than a ’80-’83 Vanagon, our shroud will bolt right on- Easily. It will no fit the CV cased Vanagon engines without serious modifications.

DTM Cooling Systems – ct’d

Does the engine need any machine work for the shroud to fit?

No, almost all the 911 arrangements require machining of the case, but the DTM does not. The DTM requires that 3 holes be drilled, and then the shroud slides right on and bolts down like a charm!

What if I have a lot of cylinder shim, due to having a stroker Engine?

No worries, the shroud easily accommodates a 0.250″ shim per suide of the engine, and can be made to do more. I have used up to a 0.455″ shim on a long rodded 2.8L engine with slight mods to the shroud

What Carburetors work best?

We have found that Weber IDF and Dellorto DRLA series carbs give the best tuning and bang for the buck. The shroud is easy to use with these and everything clears easily. Some customers have used Kadron carburetors but we have had poor luck with these on conversion engines.

What Linkage works best?

I prefer hex bar linkage from www.cbperformance.com when working with Webers and Dellortos. We are currently designing our own custom bellcrank linkage to work specifically with a DTM. We will also be carrying the CB linkage kits at a later date.

What Alternator? Will A Generator fit?

Yes, the shroud will work with either an alternator or generator. The shroud was designed and fitted with an AL-82X alternator, and that’s what we mock them up on with here at the shop, on our test fit engine. The AL-82X is what we recommend, because it is the best available today, and the simplest to wire up. We offer these in our Stage IV and deluxe kits. If you have a generator, you may need a small shim between the alternator stand and the Generator to correct belt geometry.

What cooling parts work with the DTM?

Any 1971+ Bug “doghouse” cooling fan, alternator and backing plate assembly from a VW Type 1 engine. Basically all the parts including the generator pulley and strap.

Is the Alternator hard to change?

ABSOLUTELY NOT! I think this is a very strong benefit of the DTM. Many alternators are hard to change, or take an hour to remove. With the design of the DTM remove 6 bolts and the entire assembly is out in less than 5 minutes in a beetle!

Is the Type IV engine heavier than a TI?

27 pounds is the difference between a DTM converted engine and a stock 1600cc Type I engine. If your Type I engine is built on one of the “NEW” cast aluminum cases, then your engine case is HEAVIER than a Type IV and ½ as strong!

What type of exhaust is best for the conversion?

This is the only battle that we are still fighting, but we have it solved. Currently www.ahnendorp.com has the best system for a conversion engine, IF YOU ARE WORRIED ABOUT COST!. If you want the ultimate, see www.tangerineracing.com for the ultimate “Superheader”. Exhaust on the Type IV engine is of utmost importance, and cannot be overlooked.

Does it work?

Yes, just see our dyno data on this site. We spent over $500.00 in fuel testing our shroud and over 60,000 gallons of water passed through our dyno. When we say “Dyno Proven” We mean it! Our system cooled 75°F degrees BETTER than the best 911 system we tested in a back to back session. To put it simply, the shroud is unparalleled!

Will my engine overheat?

There are a lot of variables with engines and the heat they produce. I can say that I have used DTM shrouds on engines above 2600 ccs with great results. The design of the engine is very important (that doesn’t mean just set your CR Low!!) and some engines will overheat in Anarctica, no matter how they are cooled. Our test engine was a 2270cc, 160BHP engine with a static Compression ratio of 9.5:1. The engine ran extremely cool (see our dyno pages for raw data)and basically could would not attempt to over-heat till we doubled the load and RPM of the tests(that’s in a 160 degree dyno cell). No other system would do this, Not even a 911 system. Basically if your engine is designed correctly, size does not matter, the DTM will cool it. We do discourage the use of huge 103+mm cylinders, simply because they are not needed to make a powerful engine, and they drastically reduce the longevity of the longest living aircooled 4 cylinder engine available.

What if I live in Arizona or Nevada? Will my engine run hot?

Once again, not unless you have a misconfigured engine. Even though the temps are high in the desert, the humidity is low. Look at our dyno results and you will see that our low humidity and high temps barely affected head temperatures. I have sold engines with DTM shrouds as far away as Singapore, and not even that engine ran hot!

Still need help? Open a Support Ticket.

For Flat 6 Innovations inquiries please create a ticket in an appropriate category.

For Raby Aircooled Technology inquiries please open a ticket in the “R. A. T. Contact and Support” Category.

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Frequently Asked Questions

What services does Flat 6 Innovations offer?

Flat 6 Innovations offers turnkey complete upgraded engines for all six cylinder Porsche sports cars. We also offer preventative maintenance services, like IMS Solution retrofits. We also offer in-depth internal engine repairs.

Does Flat 6 Innovations offer full service engine rebuild/ reconstruction to include extraction and installation?

Yes, we prefer to receive full vehicles, extract the engine, and then reinstall it, then test it to perfection, following with a dyno session.

Does Flat 6 Innovations accept “engines only” without vehicles?

Yes, we have programs to support engines only. These are normally reserved for international purchasers, or those far, far away.

How long does the typical order for an engine take to be filled?

This is dependent upon the time of year the engine is ordered. We work to keep our “Stocker” engines, and some Stage 1 engines in stock for immediate delivery. Stage II, Stage II Plus, and Stage III Engines can take up to 1 year to complete, due to backlog, and the time required to create them.

Does Flat 6 Innovations offer brake, suspension, or other vehicle upgrades?

No, we are not a one- stop shop. We don’t believe anyone that works with engines at our level should be. 100% of our focus is dedicated to internal engine endeavors, development, and building the best engine possible.

Does Flat 6 Innovations offer machine work for engines to the public?

No, 100% of our machine shop capability is dedicated to our engine program.

How long will my car be at Flat 6 Innovations?

If you opt for as Stocker, or Stage 1, the car may only be here for 3 weeks, if the engine that you ordered is in stock. Vehicles to be fitted with Stage II, Stage II Plus, or Stage III engines will remain on- site for 3.5 months.

Are cars stored indoors while at Flat 6 Innovations?

Yes, vehicles are stored indoors at all times.

Can l visit Flat 6 Innovations?

Yes, with some conditions. We are a small, dedicated facility, and we don’t have time for tours unless someone is genuinely interested in purchasing one of our engines. Ultimately its best if a visitor is ready to make a commitment to purchase our engine during their visit. We welcome tours by those who have their engines in process here, and we can schedule these tours months in advance.

Can l email Flat 6 Innovations for free technical consultations?

No. While we do offer technical consultations, and even online, and hands- on classes, these are not offered for free. Any technical consultation charges are refunded in, full if a paying customer for technical consultation buys an engine from our company. This does not include class attendees.

Does Flat 6 Innovations offer machine work for engines to the public?

No, 100% of our machine shop capability is dedicated to our engine program.

Does Flat 6 Innovations offer individual components/ parts sales?

No, Flat 6 Innovations does not sell any individual components. All we have to sell are our engine packages, which are damn good.

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