New 914 owner! Already dreaming of engine swaps..., What would you guys think about a 4A-GE blacktop in a 914? |
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New 914 owner! Already dreaming of engine swaps..., What would you guys think about a 4A-GE blacktop in a 914? |
betz |
Nov 6 2018, 04:07 PM
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#1
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Member Group: Members Posts: 76 Joined: 22-October 18 From: San Leandro, CA Member No.: 22,593 Region Association: Northern California |
A little background: I have 3 cars besides the 914: A stock '00 Boxster, a restored '86 E30 BMW with a 2.8L stroker M20, and a '06 Outback XT. All manual trans.
I found this 1972 914 1.7 on craigslist for $1600 and the main selling point to me was that most of the parts were there, it just seemed to need some basic TLC to get it running. Also, its a California car and not a total rust bucket. Also hasn't appeared to be in any major accidents. After pretty much finishing my E30 I've been itching for a new project... Ideally smog exempt. (IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-22593-1541542078.1.jpg) The plan for the car is to get it running with the original type 4. The PO, who only had it for a few months, said he thinks it needs a fuel pump... turns out, the fuel pump wasn't even plugged in. So OF COURSE it's not running. He got it to start briefly with just starter fluid, so I'm thinking that's pretty much it. I'm going to bring it back to stock configuration on the D-jet, change out the oil and fuel, plug in the dang fuel pump in and I pretty much expect it to start up no problem. From there, I will get into the restoration phase. Take it down to bare metal (I believe the car was originally black, and has total crap paint job) tackle any rust, then repaint. Then get the interior/ exterior trim all sorted. And, if I get through alll that... I will probably want to undertake a motor swap, unless I'm just in love with the type 4. I tossed a few ideas out there, but my ideal motor would be a light, high revving motor with ITB's. Since S14's are not exactly obtainable, the 20V 4A-GE blacktop is my best idea so far. KEP makes an adapter for it, plus, it doesn't make enough power to break the stock 901 trans. I am a mechanical engineer with access to a machine shop, so fabbing some engine mounts, routing cooling system etc will most likely be pretty doable. What do you guys think? Am I in over my head? |
Dave_Darling |
Nov 15 2018, 06:27 PM
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#2
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914 Idiot Group: Members Posts: 14,974 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
We know people who run Type IV motors at 7K RPM pretty regularly. Those are race motors, though, and not really suitable for anything but a race car. (Lives in a very narrow power band, gets torn down every weekend, and so on.)
Valve train is one limiting factor for RPM. We have heard of people lightening the stock rocker arms, using high-rate springs, and so on. That helps keeps the valves under control at higher RPMs. So does using lightweight valves and other moving bits (e.g., retainers). Simply stuffing the largest valves possible into a cylinder head isn't going to be the best you can do. A good cylinder head specialist will work with you on desired power level, RPM range, cam, carbs, exhaust, and so on, and will optimize flow by working the port shapes as well as port and valve sizes. Remember that larger valves are heavier than smaller ones, and require more spring pressure to control. Lots of stuff can be done. If you know someone who really can do the work well, an honest 150 HP should be very possible. Note that once you go above ~74mm stroke, one of the rods will start getting perilously close to one of the cam lobes. Double and triple check before you get too deep into it!! Some folks go to reduced base-circle cams for extra clearance. Which works, but seems to be a bit harder on the cam/lifter interface. Your wallet size will have a very very large effect on how much power you can extract from the motor. And on its durability. Building both of those at the same time can take a lot of work--and therefore a lot of money. --DD |
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