Header and exhaust advice please :)

[Munky King]

I’m after some advice on headers and exhausts...

Seems like it’s been a bit of a hot topic in the past, but a lot of the threads I’ve searched have been older.

I’ve decided to drop the engine in my 914 into my ‘75 911 project.

The engine I think was put together by Henry Schmidt (though I may have the wrong Henry here - not much info from the prior owner) and it’s a ‘75 2.7 case made into a 2.8.

Claimed compression is 10.3:1 according to some older PCA race documents along with a claimed 92mm bore and 70.4mm stroke. The build seems to date back before 2010.

It’s currently running 46 IDA Weber’s and headers with a couple of cherry bombs on the end.




Paperwork claims it has an RSR clutch and flywheel and also has twin spark heads.




Being full of dreams (among other things) but little talent to back it up, a friend has offered himself up to help me out with the swap. I would like to get as much on hand before he helps. I also have the stock 2.7 to draw tinware and engine mounts etc from.

At the moment, the headers are roughly 1.62” OD (and judging by the superb engineering in the car this diameter is possibly optimal) I wondered what people would suggest for a reasonable system for when it’s put into the 911?

I like the idea of it being fairly quiet - doesn’t have to be stock quiet, but also I like the idea of two rear facing pipes (to make the noise go away from me / my passenger).

I would replicate what’s on it now, but for the 911, but to be honest, however good it sounds (which is absolutely amazing and not like most 911s that I hear locally), it does feel like the end of the world is coming! Way too loud for the street.

Also the clutch seems amazingly on or off. Fine for a race car, but not too good for a Sunday morning ‘blat’.

I would like to keep the cost in the realistic ball park,as I’m also having to shell out on oil lines, oil coolers - not to mention a ton of auxiliary things, just to get the engine in and running.

Thanks for any thoughts, experience or advice!

[zedsn]

Do you want heat or no heat? Dansk make some nice exhausts. The sport one has a real nice tone but the cheaper one sounds good as well. Not sure if I would go with 1 3/4" headers. You might be better at 1 5/8" headers. I am sure others will chime in.

[EdRogers]

Myself, I would buy a used SC exhaust, or something similar to get the car going. You've got a fun, but big job getting the engine in and running. Are you using the stock 915 on the 911?, Then just use the stock clutch for a while. Get everything working first, then make everything the way you want it. Do you want heat? I bet that 914 with the cherry bombs sounds awesome!

[mb911]

Wow looks like 915/916 trans in the 914.. Very nice.. I would suggest 1.625 heat exchangers personally .. If you are finding it is to much like a light switch I would suggest 1.5" that will help with midrange..

[Munky King]

Thanks

I’m not too concerned about heat, so that might save me a little.

Also I’m going to use the 915 out of the 911, so I could use the stock clutch and flywheel too. The delivery isn’t too bad, I just wonder how long it would last for...

The 914 weighed in at 1903lbs including driver at its last race. With roughly 280 on tap (allegedly) its no wonder it feels like a mini rocket ship. Hence the desire to shoe horn it into my ‘75.

My friend just dropped over to see what’s needed. I think he was surprised by the sound the 914 makes. You’re right, with those cherry bombs it just sounds AMAZING (for about 10 mins!)

My friend isn’t sure I should be doing it. He thinks that the 914 is too good to steal the engine from... but he’ll give me help if I decide to do it. Damn.

The 1.5” to offset the output is a good idea. Thank you.

Mb911 - we’ll spotted! It is a 915 with LSD and Wevo out the back. I’m hoping that should make the swap easier - transferring the engine from one 915 to another.

I need to work out the cooling and the fueling too. The 914 has dual fuel pumps and swirl pot with a central oil cooler setup. Think I’m going to be busy.
This is what the car currently looks like:

[mb911]

Originally Posted by Munky King

Thanks

I’m not too concerned about heat, so that might save me a little.

Also I’m going to use the 915 out of the 911, so I could use the stock clutch and flywheel too. The delivery isn’t too bad, I just wonder how long it would last for...

The 914 weighed in at 1903lbs including driver at its last race. With roughly 280 on tap (allegedly) its no wonder it feels like a mini rocket ship. Hence the desire to shoe horn it into my ‘75.

My friend just dropped over to see what’s needed. I think he was surprised by the sound the 914 makes. You’re right, with those cherry bombs it just sounds AMAZING (for about 10 mins!)

My friend isn’t sure I should be doing it. He thinks that the 914 is too good to steal the engine from... but he’ll give me help if I decide to do it. Damn.

The 1.5” to offset the output is a good idea. Thank you.

Mb911 - we’ll spotted! It is a 915 with LSD and Wevo out the back. I’m hoping that should make the swap easier - transferring the engine from one 915 to another.

I need to work out the cooling and the fueling too. The 914 has dual fuel pumps and swirl pot with a central oil cooler setup. Think I’m going to be busy.
This is what the car currently looks like:

914s are my thing check out my signature.. I make all kinds of parts for them so know all the little 914 only things..

[Munky King]

Originally Posted by mb911

914s are my thing check out my signature.. I make all kinds of parts for them so know all the little 914 only things..

This is the only 914 I’ve even sat in! I’ve come to realize I kind of like them and being 6’2” appreciate the leg room too!

[Speed metal]

Yeah! Keep that car together and make her street legal!I agree with your friend on this one

[mb911]

Originally Posted by Speed metal

Yeah! Keep that car together and make her street legal!I agree with your friend on this one

I agree.. Believe it or not 914s are becoming valuable.. People also like the balance and the fact much is interchangable with 911s.

Build another engine for your 75.

[Flojo]

Originally Posted by mb911

I agree.. Believe it or not 914s are becoming valuable.. .

not this one though. only the original, unmolestet 914s get prime attention.

[mb911]

I dont know about that.. Recently there have been some -6 conversion cars on BAT bring big money.. No more of the 20k 6 conversion..

My business model revolves around -6 conversions and I can tell you 1st hand things have changed dramatically within the last 2 years.. Look at PMBs website for the builds they are doing or PMS..

This one looks like its a decent car. Make it a street car.

[75 911s]

Tough choice. That's a sweet 914 and would be a killer street machine.

As for header choice if you do make the swap... I'd go with SSI. I think they are perfect size for a 2.8 and they have heat. This coming from someone who lives on the surface of the sun in Las Vegas!

They look great, they work great and they hold resale value if you aren't happy with them.

[Munky King]

I think with a decent set of tires (the current are like hockey pucks) it would give my Ariel a run for its money.

Another reason why I wanted to put it into my 911...
It is nicely set up though...

Just checked out that for $100 or less, I could get a single wire in horn and indicator set for it (brake lights already work) from evil bay.