Oops, a perios got stuck on that link so it dodn't work. Try this :

http://www.datsuns.com/torquehp.htm


Also see http://www.datsuns.com/techmenu.htm for more tech articles

Dave Lum
'72 coupe getting SR20DET
'71 510 w/ VG30DE
www.datsuns.com

You seem to have missed the point but answered your own question. HP is acheived by a combination of revs and displacement. The air pump scenario is good , by adding a turbo/supercharger
you squeeze more air too.Upping the compression ratio does it too,but at the expense of drivability. By increasing the size of the cylinders also allows more air to be pumped. Truck engines
develop huge amounts of HP and torque using low revs and high compression as do Trains etc, revs does not equal HP alone. Race trucks downunder are speed governed to 100 mph to keep things
safe. They are mighty fast in fact a few years back a race Scania took on a full noise GRP A BMW M3 from a standing start and raced a lap around Englands Brands Hatch circuit, to everyones
amazement the truck won and it's rev limit was 4500 rpm. I love the A12 motor it is definately my favorite motor and I've certainly built plenty of them but Cubes will beat a hiroshima
screamer anyday. Just to lighten things up a little I'm currently working on a friends 1200 coupe with the ultimate in an overkill engine.... a 355 Chev with a 671 Blower!!! And it's all
sreet legal and boy does it turn heads. It's bloody fast in a straight line but in the twisty bits a Lada would outhandle it but it was'nt built as a canyon racer. If I was asked what a
good street combo would be I would go for the A14/15 as it does'nt need to have it's ring revved off it to shift the little Dattos.

At 14.7 lbs of boost, you effectively double the size of the "air pump." With all of the controversity about which motor is the best for the 1200, all of them are fun and the reliability is
next to none. It is just plain hard to hurt one of the little monsters if you keep it full of oil and keep it cool.
In 1982, I met a guy that had a 1200 and it had one of the worst knocks that I have ever heard. I told him that I had a motor for it if he wanted to replace it. He said that he couldn't
afford to at the tiime. For over a year, he kept driving it. I saw him without the car one day and he said it finally quit on him. I towed it home and replaced the motor. Before I took the
old motor out, I tried the starter and it cranked and I could still hear the knock but it wouldn't start. I put some gasoline in it and it started right up and sounded as I had always heard
it. I replaced the motor and when I took the bad motor apart, it had worn the bearing totally out of #1 rod journal. The rod was slinging around the crank but the cylinder had still been
operating. I took the crank to the machine and a .030 grind cleaned it up. I rebuilt that motor and sold it later. That motor had been running for over two years knocking and without a
bearing i the journal and was still hanging in there when I replaced it. He hadn't blown it as he thought, he had ran it out of gas. That proved to me that they are bullet proof. What other
motor would hang that long with a bearing totally worn and gone and still keep on being driven? The A-series motors are made of excellent metals and are super engineered. All in this club
will agree to that. That's why we all have that 'insiders' grin. The old VW owners knew that they would have to keep on working on their motors just to drive them. Datsun motors outlasted
their bodies. People think that a Nissan is a Datsun. Nissans are OK but Datsuns were race engineered.
Mareo

Upping the compression ratio does not squeeze more air into the cylinder, it just compresses more of what you have so you can use a different fuel with more power potential.
1171 cc's are 1171 cc's, no matter what the compression ratio is. A blower does squeeze more air in.

I was talking general terms in RPM=HP. No replacement for displacement - why else do you think I have 3 liters of engine in my 510

Compression doesn't compromise driveability so much as it makes it harder to find fuel with a sufficient octane level to support it (which I suppose is a "driveability" problem as you
have to drive to places that carry adequate fuel). Low rpm torque (most equate this with driveability) is enhanced with higher C.R.

On these low RPM engines with big displacement: Trucks like Freightliners make 400hp and 1100+ ft-lbs of torque. Sure 400HP is a lot of HP, but for 8 liters of turbocharged engine it's
not so impressive. Works well for hauling loads becuase low RPM engines last longer than high RPM ones.

On this 355/6-71 equipped 1200. Are you building it or is it done? Any pictures of it? I had briefly considered a 400cid in my 1200, but decided I like not having to come to a complete
stop to make a corner. Would be fun in a straight line, though.

Dave Lum
'72 coupe getting 320hp SR20DET
'71 510 with 230hp VG30DE
www.datsuns.com

Some Nissan engines are also "race engineered". The FJ is a race-turned street motor. The VQ series was designed for competition use but the class was removed before the engine could
be competed. The SR is also overengineered. In the states, there's a 392hp / 288Kw (TO THE WHEELS) SE-R with a STOCK SR20DET bottom end. Did I mention this is a street car? That's
triple what the stock non-turbo SR makes, and the blocks are the same. Check out http://www.se-r.net/car_info/project_cars/searl_tate/index.html

In any case, gimme a Nissan/Datsun over anything else.

Dave Lum
'72 coupe gettng SR20DET
'71 510 w/ VG30DE
www.datsuns.com

How much turbo boost do you think a fairly stock (rebuilt) A15 engine can hold up to? It has stock rods/pistons/crank, and about 8.5:1 compression. Do you think a turbo off of a 1986
Subaru Turbo Wagon (1.8L Turbo) would be about the right size for a healthy A15? The reason I ask is that I'm buying fuel injection from one of our beloved members, and after I put that
and an aftermarket computer on, I have a good Turbo from our old Subaru that I want to put on it. I will probably get a small intercooler from the junkyard also. I had one in my hands from
a Volvo Turbo, but didn't have money for it at the time. I was going to spill some antifreeze in it, and tell the junkyard cashiers that it was a heater core from a truck to get it even
cheaper, heh heh heh (at this junkyard they couldn't tell the difference anyway). I think the A series engines should've been turbocharged from the factory, now that would've been cool!

-Andy

Not sure on the boost. I was thinking 8-10.
I have a turbo out of a 1.6L Dodge Colt. That's about the smallest turbo you can get except for the Chevy Sprint turbo (about the size of a pop can). I figured the Colt turbo would be about
the right size. I have an oil cooler out of a Dodge Daytona also. The intercooler I almost got at the junkyard for 15 buck.
Seattle has PICK-A-Part/PULL-A-PART junk yards that really don't deal with special parts and are just in the business of selling. They had a Starion out in the yard and I told then I needed
an intercooler. They had no idea what it was, I said it looked like a radiator. The guy looking in his book, Radiator-$15. That was what he was going to sell it for. But when I went out to
the car, GONE!!! I was disappointed. No other intercooler cars out there. Starion or Eagle Talon would be the best. They are small but still efficient. I have all the parts for my turbo
setup but havn't had the time to fab the exhaust maifold. I did build an aluminum box for my DGV Carb. Everythings on hold right now.
I'll get back on it when I get more time.

The V8 1200 is running around the streets terrorising our local neighbour hood. The engine is mounted via a solid motorplate which in turn bolts to the crossmember bolts on the chassis
rails. It runs a super T10 4 speed through to a narrowed Ford Falcon Borg Warner diff. It has 4 wheel discs with 4 pot RX7 front calipers. It was originally built around 10 years ago with a
2 Litre turbo L series motor. The fire wall and trans tunnel are modified considerably but there is still plenty of room inside. The blower was dropped on it as a joke which stuck, it is
fully functional and currently runs underdriven. I have a heap of photos to post on the club noticeboard as soon as I get around to scanning them all. There pics from over 19 years of 1200
ownership. I will get on to it soon.

Damn. Are passengers requierd to wear G-suits? Or maybe diapers?

Dave.