1973 Rebuild

[Matthew Abate]

Quick question: is it safe to submerge the float on the fuel level sender in carburetor cleaner? Planning to clean out the tank tonight and want to use the sender as a plug, but don't want to end up with melted float all over the inside of the tank.

Edited July 28, 2016 by Matthew Abate

[ksechler]

On 7/11/2016 at 7:22 PM, Matthew Abate said:

 

That hole isn't very hard to plug because of the o-ring.  I just cut a circular piece of plastic and used the locking ring from the sending unit to hold it on.  It worked fine.  

Edited July 28, 2016 by ksechler

[Matthew Abate]

Good suggestion, thanks.

[siteunseen]

Z Therapy says not to soak the floats for the carburetors in carb cleaner, it'll eat them up.  I don't know if they are made of the same material though, just putting that info out for you.

[Diseazd]

Sorry Matthew, I haven't read through this thread yet, but just got your PM. Let me start by saying that I've done basically two L28 builds. Two with L24 crankshafts and rods and two with L28 crankshafts and rods. All four engines have the F54 blocks bored .040 over with Nissan or LTM P79 flat top pistons and SU's....none have headers. All four engines have P79 heads (same head as P90 head except P79 has liners) shaved .080 then shimmed up (valve springs and towers) .080 to keep chain height and geometry straight. The engines with the L28 cranks (to the best I've been able to determine) give you close to 10:1 compression ratio.....the L24 crank and rods will give you about 9.3:1 compression ratio. If you don't shave and shim the P 90 head, you're shooting yourself in the foot IMO. The N 42 head would probably be a better choice (I've never used the N42 head, so can't comment on engine knock.....mine have "0" knock....ever) because of the higher CR, but the P79 and P 90 is a more modern combustion chamber. All four engines use Isky reground Stage III cams (I wouldn't use anything less....they are fantastic) and valve springs. The rockers will geometry correctly using between .150 and .180 inch valve lash pads. These engines are very quick (not brutal), and very streetable and a blast to drive. Not sure which is my favorite, but the L28 crank is done at 5500 rpms (as far as power) and the L24 seems to go another 1000 rpms to max power (by the seat of the pants not yet dynoed the L24 crank engines). Both push 170 hp at the wheels (200 hp at the crank). These set ups were recommended to me by my Z expert friend the Z Doc who is no longer with us, but I always consulted with him (He built the heads, I built the rest). I don't have any other experience with Datsun modded engines although I think I might build  a stroker engine since I recently acquired a diesel crank (If I do, I'll be seeking advice from someone on this forum who can help me with that build). If either of these engines interest you, I can certainly help you with your build, and will answer any questions you may have. Both engines are awesome......I love each equally. Good Luck and let me know if I can help. BTW ....if you want to hear that engine, go to my profile....go to topics and check the youtube video in "Me and Eiji head to head". He turned a 14.30 quarter mile and mine was 14.85 (he had 100 more hp)

Guy

[Patcon]

2 hours ago, Diseazd said:

He turned a 14.30 quarter mile and mine was 14.85 (he had 100 more hp)

It cost to go fast and fast takes horsepower. That extra 100 HP probably tripled the cost of his engine! Only got him 0.55 seconds...

[Diseazd]

You are right on Charles.....and if you want a totally fun and reliable street car that runs on pump gas, more H.P. Is not always better. However, I really want another shot at Eiji....therefore I'm going to build something to go back and try to even the score....therefore the stroker crank! 

[siteunseen]

I'll do the reading later but you're saying I can use a 2.4 crank with the matching 9mm rods and put p79 86mm flat tops into an f54 and it will run a 1,000 more rpms with the proper cam and head work?  If so that's my next motor!  Amazing the interchangeable innards of the L motor. 

[Diseazd]

......and you'll absolutely love the result. But remember ......the P79 head must be shaved and shimmed to get to 9.3 to 1. You might be able to bolt an N42 head on top and get the same result, but I've only done it with the shaved and shimmed P79.

[siteunseen]

I just so happen to have an e31 with a pretty aggressive cam kit sitting under my guest bed.  I was going to bolt it on the 2.4 I just finished.  Thank you Guy for new options.

[Matthew Abate]

So when you want to clean out a gas tank, after you tape up and seal all of the tubes make sure you put the tank plug in BEFORE you poor a gallon of carb cleaner into it.

[emoji21]

[Captain Obvious]

Umm... Why? What happens if you don't?

(I just want to hear you say it.....  )