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+--- Thread: A little update on the car.... (/showthread.php?tid=96234)
A little update on the car.... - Mickk - 03-30-2013
So, the father discovered that a 1.6 liter motor will fit the Pulsar in place of a 1.8 liter motor.
Apparently the only difference in the two motors, apart from capacity, is that the bore is different, the block is exactly the same.
The other difference is that the 1.6 liter motor has a "throttle body", while the 1.8 liter has "multi-point fuel injection".
The current plan is to fit the 1.6 liter motor, remove the throttle body and install the fuel injection.
My question is and I plan on doing some research, is how much of a difference is the fuel injection going to make over having the throttle body?
I don't know a lot about motors, I'm used to normal carbs and simple things like that, so any information would be useful.
Please, if you don't know, don't troll, okay?
My nephew is going to be NOT HAPPY when he finds out the car is getting a smaller motor.
RE: A little update on the car.... - Agmen of Eladesor - 03-31-2013
Throttle body fuel injection versus multi-point fuel injection is pretty simple.
Throttle body has one injector that shoots fuel into manifold and then to all intake ports at the same time, similar to your basic carb. Multi-point injection sends the fuel to each intake port individually.
Multi-point fuel injection - IF the car is tuned properly and the computer is set up properly - will result in better fuel economy AND more power than throttle body injection. HOWEVER ... you saw that big IF up there, didn't you? Since you're using a smaller bore, if you don't adjust things right, you're going to be stressing the smaller cylinders because they're going to have too much fuel going in and have a chance to crack the heads.
I've actually learned more about how (new) car engines work in the last four weeks than I think I had in the past 25 years - and that includes the time I was working at the auto assembly plant. Now I'm selling them - and when we have a car that can go straight from the showroom floor and do rally road racing with a 305 hp turbo 2.5 liter, and another that weighs in at 2,200 pounds and has a 200 hp turbo 2.0l engine ... I'm amazed at the little car company that could.
RE: A little update on the car.... - Mickk - 03-31-2013
(03-31-2013, 03:41 AM)Agmen of Eladesor Wrote: Throttle body fuel injection versus multi-point fuel injection is pretty simple.
Throttle body has one injector that shoots fuel into manifold and then to all intake ports at the same time, similar to your basic carb. Multi-point injection sends the fuel to each intake port individually.
Multi-point fuel injection - IF the car is tuned properly and the computer is set up properly - will result in better fuel economy AND more power than throttle body injection. HOWEVER ... you saw that big IF up there, didn't you? Since you're using a smaller bore, if you don't adjust things right, you're going to be stressing the smaller cylinders because they're going to have too much fuel going in and have a chance to crack the heads.
I've actually learned more about how (new) car engines work in the last four weeks than I think I had in the past 25 years - and that includes the time I was working at the auto assembly plant. Now I'm selling them - and when we have a car that can go straight from the showroom floor and do rally road racing with a 305 hp turbo 2.5 liter, and another that weighs in at 2,200 pounds and has a 200 hp turbo 2.0l engine ... I'm amazed at the little car company that could.
Thanks Agmen.
I did a little looking around on the interwebs and it appears that Nissan actually produced a 1.6 liter with multi-point fuel injection at one point, so there *shouldn't* be any major dramas.
I'm actually interested to see how this is going to work out, as all of the work is being done by my father, with a little help from me with doing the heavy stuff.
RE: A little update on the car.... - Coin - 03-31-2013
why are you rebuilding the engine so extensively? is the 1.8 knackered? is the throttlebody knackered?
hooking up a smaller power unit to a larger powerunit's gearbox can cause horrendous problems to the thrust bearings on the clutch. are the gearboxes the same across the models? if not, take the 1.6 gearbox with you, or the car could spend more time getting the clutch assembly replaced than actually being on the road.
are the multi-point fuel injectors identical between the 1.6 and the 1.8? i ask this cos logically the 1.8 would require a faster flow rate than the less thirsty 1.6. how adjustable is it?
if you point out to the nephew that less thirsty engine means less money on fuel, and more money to spend on girls. insurance should be cheaper too.
RE: A little update on the car.... - Mickk - 03-31-2013
(03-31-2013, 12:19 PM)Coin Wrote: why are you rebuilding the engine so extensively? is the 1.8 knackered? is the throttlebody knackered?
hooking up a smaller power unit to a larger powerunit's gearbox can cause horrendous problems to the thrust bearings on the clutch. are the gearboxes the same across the models? if not, take the 1.6 gearbox with you, or the car could spend more time getting the clutch assembly replaced than actually being on the road.
are the multi-point fuel injectors identical between the 1.6 and the 1.8? i ask this cos logically the 1.8 would require a faster flow rate than the less thirsty 1.6. how adjustable is it?
if you point out to the nephew that less thirsty engine means less money on fuel, and more money to spend on girls. insurance should be cheaper too.
Coin, see this thread for why it's happening. --> http://discoverygc.com/forums/showthread.php?tid=95857
The Pulsar Q comes in two engine sizes, the 1.8 which is the motor that spat out and has MPFI as standard and a 1.6, which comes with TBI as standard.
We have been told that the MPFI system from the 1.8 will essentially just 'bolt on' as they say, but I personally have my doubts.
According to the workshop manual, the only real difference between the two motors is the size of the cylinder bore, the 1.8 having a bore just over 4 mm bigger than the 1.6.
As to how long the whole deal is going to take, I have no idea, we haven't gotten our hands on the 'new' motor yet.
RE: A little update on the car.... - Mickk - 04-09-2013
*the sound of digging is heard.
Well, better to dig up and old thread than start a new one on the same subject.
So, here is a little update on the car.
We got hold of a second hand motor, finally.
It's a 1.6 liter as mentioned previously.
Both motors look identical with the manifolds removed.
Note I said 'look'?
The intake ports are different, so the Father is putting the 1.8 liter heads on the 1.6 block.
It's easier than it sounds, as the heads for the two motors are identical in every way, except that the intake ports are different.
The head has bolted straight on, no problems at all and external items bolted on.
I reckon a few more days and I'll be helping fit the motor back in the car.
I have a strange feeling that it might not even need to be tuned beyond getting the timing on the motor sorted properly.
RE: A little update on the car.... - SMGSterlin - 04-09-2013
1.8 liters?
How small is that engine, 2 cylinder? :P
RE: A little update on the car.... - sindroms - 04-09-2013
Not everyone has a small dick, Sterlin.
RE: A little update on the car.... - SMGSterlin - 04-09-2013
(04-09-2013, 12:34 PM)sindroms Wrote: Not everyone has a small dick, Sterlin.I'm sure a lot of people have decent sized schlongs, you don't have to be jealous of them though Spazzy, I'm sure there's someone out there with one smaller than yours...
....
Ok, maybe not, sorry.
RE: A little update on the car.... - sindroms - 04-09-2013
It was not aimed at you, you tart.