Tracking the 914 - Need some street love too..., Turning this into a regular thing... Options

[infraredcalvin]

Glad you got good help on that thread. It was kinda interesting how that thread evolved! William is the man, sounds like you got good advice.

On the cooling, 250 is a little hot. I prefer closer to 200 which is achievable with a good size cooler and good airflow and ducting.

Thanks, and agreed! I didn’t like seeing that, the shrouding will be addressed before my next track day.

Dumb question, I was looking at gt-racing website for 1 3/4 headers, in the description they state 1 3/4 OD pipes, 42mm ID, is this true of all 1/34 headers - as measured from the OD? If so I need to remeasure mine, I might already have them….

https://www.gt-racing.com/porsche-914-europ...part-914-6-134/

[Justinp71]

Glad you got good help on that thread. It was kinda interesting how that thread evolved! William is the man, sounds like you got good advice.

On the cooling, 250 is a little hot. I prefer closer to 200 which is achievable with a good size cooler and good airflow and ducting.

Thanks, and agreed! I didn’t like seeing that, the shrouding will be addressed before my next track day.

Dumb question, I was looking at gt-racing website for 1 3/4 headers, in the description they state 1 3/4 OD pipes, 42mm ID, is this true of all 1/34 headers - as measured from the OD? If so I need to remeasure mine, I might already have them….

https://www.gt-racing.com/porsche-914-europ...part-914-6-134/

Yes I believe all 1 3/4" headers are measured by OD. I know in general Tubing is measured by OD, piping is measured by ID. This is where I got my headers from-

https://www.msdsinc.com/exhaust.html

[infraredcalvin]

No new updates, but maybe a few pics to stay relevant. Looking forward to getting some assembly time this weekend.

Made POC Aug Velocity Mag, we need more 914s out there!



Here’s a removal pic, how many 914s can you spot?

[Justinp71]

Cool it made POC mag!

I see 2 914's, do I get a prize? (IMG:style_emoticons/default/smile.gif)

You get out there last weekend?

[infraredcalvin]

Ha, no prize for you, there are 3, if you zoom in on the light blue in front of the RR you’ll see a silver sail panel and Olympic blue a pillar….

I did get there, basically got it in the same condition as the pic, ready to reinstall.

I do need to source some bushings for the throttle pivot on the carb risers, would love copper bushings, but don’t know where to source. Any ideas?



Although, genius me didn’t measure the od of the pivot bar… (IMG:style_emoticons/default/headbang.gif)

[campbellcj]

I'm also inching along (way slower than you) towards getting back on the track - car is in the shop now for trans refresh and other odds and ends - look forward to hopefully seeing you out there soon. I'm not sure I can make Chuckwalla/POC but maybe.

I've noticed the aircooled 911s have largely been retired from track use as well as the 914s and it's kinda sad but understandable...

[Justinp71]

Ha, no prize for you, there are 3, if you zoom in on the light blue in front of the RR you’ll see a silver sail panel and Olympic blue a pillar….

I did get there, basically got it in the same condition as the pic, ready to reinstall.

I do need to source some bushings for the throttle pivot on the carb risers, would love copper bushings, but don’t know where to source. Any ideas?



Although, genius me didn’t measure the od of the pivot bar… (IMG:style_emoticons/default/headbang.gif)

Maybe that's your problem???? I probably have some I can send you, I will check tonight.

[infraredcalvin]

Thanks, I doubt it, but it certainly is not helping…

[stownsen914]

Try McMaster.com, look for flanged sleeve bearings.

[Charles Freeborn]

Ha, no prize for you, there are 3, if you zoom in on the light blue in front of the RR you’ll see a silver sail panel and Olympic blue a pillar….

I did get there, basically got it in the same condition as the pic, ready to reinstall.

I do need to source some bushings for the throttle pivot on the carb risers, would love copper bushings, but don’t know where to source. Any ideas?



Although, genius me didn’t measure the od of the pivot bar… (IMG:style_emoticons/default/headbang.gif)

Pretty easy part to make on a lathe - especially in a soft metal like copper or bronze. I've got a "Smithy" I make those sorts of things on. Do you have a neighbor / machinist? I'd be happy to knock some out if I had the dims, but I'm out of town through the weekend and there would be mail time..

[Justinp71]

Sorry I have a bell crank but don't see any bushings, my throttle shaft is 8mm or 5/16"

Pelican has a nylon one if you can't find anything else-

https://www.pelicanparts.com/More_Info/9144...4&DID=47656

[Justinp71]

...

When funds available I'll be on the lookout for 50 PMOs and 1 3/4 headers... i think we have a few sources among us...

You should be able to get 250hp to the wheels with 46 PMOs and the 1 3/4" headers, not sure how much your header size now is holding you back.

[infraredcalvin]

If 1 3/4 is the old, then i think I already have them, I’m wondering if it is muffler corking some of that…. I’ll have the engine back in tomorrow, then I’ll start detailing my tuning here - I know there’s some on the table there. Then when funds allow, 50 PMOs tuning and some dyno time and I should be closer!

[infraredcalvin]

As my 914world turns…

Motor is back in, I don’t know how this happens, but I’m not entirely happy with plug wire and my fat starter+ wire routing in the engine compartment. Too much rubbing with carb linkage, I’ll continue to sort that.

I actually got the carbs base tuned last week, but was super low on gas and started to notice my rock steady fuel pressure gauge in the engine compartment was slowly falling off its preset 3.2 psi.

Headed over with a small can of gas today, found that the PO direct wired a low gas light to the battery, luckily I left a trickle charger on the battery, the light must’ve been on all week. Well, that’s 1 of 3 aux warning lights the PO installed that I now know it’s purpose. The other two are on the a pillar padding on the roll cage (one I believe is oil pressure, not sure what the last is for).

Figured it would be a good time to change the aftermarket fuel filter in the frunk. No real issues with that, also appeared really clean.

Put in my 2.5 gal of gas re-synced the carbs and took her for a quick spin to the gas station, was running well (similar to before), so I figured I’d take a quick jaunt through the canyon, maybe take a few pics….

About 1/2 way through the canyon I realized the carbs were now idling at 2200 rpm, sometimes 2500, so no pics, and headed straight back to the shop. Carbs may not have been fully warmed up when I synced them, I set linkage too long and causing the high idle. I also noticed my fuel pressure gauge was now showing about .25 psi, so I adjusted back to 3.2 - new filter??? (IMG:style_emoticons/default/confused24.gif)

[infraredcalvin]

Well, 2 steps back this weekend, went this am hoping to get a couple of hrs dialing in advance on electromotive HPV-1 (I don’t think anyone looked up that acronym before going to print).

Went to start her up and no fuel pump buzz…

I traced back good wiring to the relay, so that leaves everything from the ignition switch to a manual switch on the dash that ultimately goes to the relay. I’ll be spending some time looking at wiring schematics to see what i can find. (IMG:style_emoticons/default/headbang.gif)

[infraredcalvin]

On a side note, I’m getting a “ghost backfire” very so often. Car will have been driven, then put away. I usually shut off the fuel pump and let it run to help drain most of the gas out of the bowls.

When back at it a day or two later, today it had been a week, cold engine, I go to start it up, turn on the pump, let the bowls fill them I hit the pump the throttle a few times. When I switch on the ignition, anywhere from immediately to 10 or 15 secs later I’ll get what sounds like a single cylinder chuff. Today it was a medium/large backfire out the muffler. Am I getting a loose spark somewhere in there that seems to be causing this? Sometime I feel it happens (quietly) when the ignition is off and I put some fuel in the cylinder.

I haven’t quite tracked it down, but today it did it twice, fairly loud, and I was having fuel pump issues…

Any thoughts?

[infraredcalvin]

Eureka! Good day today, even though it was limited time in the shop. Got oil impregnated bushings from McMaster Carr, had to open them up slightly on the lathe, but they pressed in nicely, now I have smooth throttle action.


Also found my no start issue, fuel pump switched wire pulled from the back of the fuel panel, so after dismantling that I could see where it pulled, plugged it in, recrimped a few loose wires and put her all back. Tuning, finally, tomorrow!

[Justinp71]

Sounds like your making progress even with a few set backs...

So you fixed the ghost fire and low fuel pressure issue? If you don't have alot of fuel in the tank and start doing some twisties maybe there is some air in the fuel?

Let us know how the weekend goes.

Mines been on the lift for a couple months too, hoping to get my new wheel bearing today so I can get it on the ground this weekend. Hope to take it on a road test when the rain stops.

[infraredcalvin]

Tuned a bit, got her pretty rich, but I can tweak at the track. Took her for a shakedown….



Yes I got the pump and pressure issue resolved. During my tuning I noticed one of the ignition boards is not holding my advance…. Hmmm I’m sensing this is another part of my power loss…. I dialed in the best I could, I guess I’ll be looking for a new board…. Yikes, inching ever so closely to EFI…

[stownsen914]

During my tuning I noticed one of the ignition boards is not holding my advance….

Good find! If it's off by more than a couple degrees, for sure you'd see power loss. Especially if you've got upper and lower plugs firing at different times.