n/a 2.8 stroker
#1
Burning Brakes
Thread Starter
n/a 2.8 stroker
Hey guys,
I was thinking of doing some mods to my 2.5 n/a.It's a 86' euro.Since it's kinda hard to get some real power with simple mods i'm contemplating a stroker setup.
My question to you is apart from an S2 crank what other things have to be changed/mods to do,to turn it into a 2.8?I'm thinking rods and fuel system at least.How about the head,would it be ok as it is,maybe just a port and polish.I don't really want to mess with the electronics too much,just a custom chip to accommodate the new mods,would that be enough?
Its going to remain just a street car so driveability is important.I'm not looking to get ultimate power from the setup but just to make it work to start with.
I was thinking of doing some mods to my 2.5 n/a.It's a 86' euro.Since it's kinda hard to get some real power with simple mods i'm contemplating a stroker setup.
My question to you is apart from an S2 crank what other things have to be changed/mods to do,to turn it into a 2.8?I'm thinking rods and fuel system at least.How about the head,would it be ok as it is,maybe just a port and polish.I don't really want to mess with the electronics too much,just a custom chip to accommodate the new mods,would that be enough?
Its going to remain just a street car so driveability is important.I'm not looking to get ultimate power from the setup but just to make it work to start with.
#2
Rennlist Member
all that would be critical would be changing rods and tweaking the fuel tuning (eg you would need roughly 10-20% more fuel). A chip might be able to get you enough fuel at the stock pressure, but I imagine that you will probably need to increase the pressure on the fuel rail to supply enough fuel. An adjustable fuel pressure regulator should do the trick and Lindsey Racing sells one that should bolt right into the factory spot. You would need the chip reprogrammed to provide proper fuel and spark timing for the larger displacement engine, but I would imagine that that would be all you'd need
You could get away with leaving the head and intake alone, but you would definitely see benefits to porting/polishing the head.
If you do this, please post some dyno numbers - it's something I've been kicking around in my head for a while, but S2 cranks are expensive around here so I've never gotten around to it
You could get away with leaving the head and intake alone, but you would definitely see benefits to porting/polishing the head.
If you do this, please post some dyno numbers - it's something I've been kicking around in my head for a while, but S2 cranks are expensive around here so I've never gotten around to it
#3
Rainman
Rennlist Member
Rennlist Member
custom, shorter rods will be needed. several 944 tuning companies sell them. the stock rods are too long by 4.5mm, also the lower end of the stock rod would hit the crank girdle with that stroke.
#4
Addict
Rennlist Member
Rennlist
Site Sponsor
Rennlist Member
Rennlist
Site Sponsor
The 2.8L will make more power than the 2.5L. However, unless you just want a 2.8L stroker, going to a 3L will yield much more power. We have tuned many 2.5, 2.6, 2.7 and 2.8L NA race engines. The 3L made more torque and more power. The money you will spend on building a 2.8L and tuning it properly, will cost more than finding a clean 3L engine.
If you decide to go the 2.8L stroker route, you will need 2.8L pistons, stock length rods (the 951 rods will work just fine in this application). Of course, you will need the engine management to handle the 2.8L. Fuel is just one part of the equation, ignition timing is very critical. The stroker engines love to detonate! We can supply you with the pistons to work in the Alusil block as well as the tuning. However, consider the 3L engines!
If you decide to go the 2.8L stroker route, you will need 2.8L pistons, stock length rods (the 951 rods will work just fine in this application). Of course, you will need the engine management to handle the 2.8L. Fuel is just one part of the equation, ignition timing is very critical. The stroker engines love to detonate! We can supply you with the pistons to work in the Alusil block as well as the tuning. However, consider the 3L engines!
#5
Rennlist Member
#6
Rennlist Member
The 2.8L will make more power than the 2.5L. However, unless you just want a 2.8L stroker, going to a 3L will yield much more power. We have tuned many 2.5, 2.6, 2.7 and 2.8L NA race engines. The 3L made more torque and more power. The money you will spend on building a 2.8L and tuning it properly, will cost more than finding a clean 3L engine.
If you decide to go the 2.8L stroker route, you will need 2.8L pistons, stock length rods (the 951 rods will work just fine in this application). Of course, you will need the engine management to handle the 2.8L. Fuel is just one part of the equation, ignition timing is very critical. The stroker engines love to detonate! We can supply you with the pistons to work in the Alusil block as well as the tuning. However, consider the 3L engines!
If you decide to go the 2.8L stroker route, you will need 2.8L pistons, stock length rods (the 951 rods will work just fine in this application). Of course, you will need the engine management to handle the 2.8L. Fuel is just one part of the equation, ignition timing is very critical. The stroker engines love to detonate! We can supply you with the pistons to work in the Alusil block as well as the tuning. However, consider the 3L engines!
Also, do you have any hp/tq numbers that you could share about some of those larger race engines? any info about how to get those numbers?
I realize that with race engines, there's a fair amount of confidential information, so I don't mean to pry, but I'd be interested in hearing anything more that you can share. Thanks!
#7
Rainman
Rennlist Member
Rennlist Member
Out of curiousity, is there any reason why you couldn't use the factory 9.5:1 pistons with a stroker crank and pauter rods? I know that compression ratio would increase, but my back-of-napkin guesstimate was that the CR wouldn't go much above 11, which should be well within the range of what a street motor can tolerate right?
Also, do you have any hp/tq numbers that you could share about some of those larger race engines? any info about how to get those numbers?
I realize that with race engines, there's a fair amount of confidential information, so I don't mean to pry, but I'd be interested in hearing anything more that you can share. Thanks!
Also, do you have any hp/tq numbers that you could share about some of those larger race engines? any info about how to get those numbers?
I realize that with race engines, there's a fair amount of confidential information, so I don't mean to pry, but I'd be interested in hearing anything more that you can share. Thanks!
Trending Topics
#8
Rennlist Member
The Andial 2.8 stroker turbo pistons would work, but without the turbo, the low compression would produce lower power -- although you could use cheap gas probably without pinging.
#9
Nordschleife Master
Taken from a 928 Stroker buildup I was looking at last night...
http://www.928sg.com/
not a 944, but a 5L 928 goint to 6.4L(394 Ci) He even grafted in 968 Variocam heads...
Might be worth reading for the 2.5 to 3.0+ thinkers in the group of what can go right vs what can go wrong (the main discussion engine in the website is his second engine as the first was destroyed after 5000 miles...)
Good on ya, maybe one day in the future I will pick up a second engine to build on, but for now I will enjoy driving my cars close to stock as will allow for daily driving....
#10
Rennlist Member
John, thanks for the link - I'll look into that
#11
Rennlist Member
Any ballpark guesses or hard info (John) on what sort of power / tq increases could be expected by just increasing 2.5L out to 2.8L leaving other mods out of the equation? I have a friend that we are trying to convince to do this to his n/a car. Putting a 3L 16v motor into a 944 is not just a straight swap and would cost a bit to do this conversion I'm thinking?
#12
Rennlist Member
Any ballpark guesses or hard info (John) on what sort of power / tq increases could be expected by just increasing 2.5L out to 2.8L leaving other mods out of the equation? I have a friend that we are trying to convince to do this to his n/a car. Putting a 3L 16v motor into a 944 is not just a straight swap and would cost a bit to do this conversion I'm thinking?
#13
Rennlist Member
If it were possible to use factory pistons, I would imagine that you could get better performance out of a stroker motor than the bored out motor because, all else being equal, the stroker engine would have a higher compression ratio. Then again, for comparable cost, you might be able to get high compression 104.5mm diameter pistons...
#14
Burning Brakes
Thread Starter
To sum things up i guess the stroker is out of the question,too much cost for nothing.
To clear things up my car is Row so the compresion ratio is 10.6:1 and the power rating is 163hp/205Nm.The 2.7 engine has 10.9 compression and 165hp/225Nm.
I wanted to keep the car 100% standard looking(sleeper) and get around 180hp from the stroker setup alone but it seems impossible so...
Anyway,i think the shorter rods is the better solution for a stroker instead of the special 2.8 pistons+turbo rods,it's more cost effective.
Another problem i think would be compression ratio for the stroker,if it's 10.6:1 standard what would it be after,i would not want more than 11:1.
To clear things up my car is Row so the compresion ratio is 10.6:1 and the power rating is 163hp/205Nm.The 2.7 engine has 10.9 compression and 165hp/225Nm.
I wanted to keep the car 100% standard looking(sleeper) and get around 180hp from the stroker setup alone but it seems impossible so...
Anyway,i think the shorter rods is the better solution for a stroker instead of the special 2.8 pistons+turbo rods,it's more cost effective.
Another problem i think would be compression ratio for the stroker,if it's 10.6:1 standard what would it be after,i would not want more than 11:1.
#15
RL Community Team
Rennlist Member
Rennlist Member
Without expensive race tuning, race parts, and race prepping/machining, just how much power do you think a 2.8L 8v can make? I bet less than 180 crank hp. Seems like a giant waste of money to me; for a 2.8 just the pistons and crank alone will cost you about $2k. An S2 engine is less than $2500 and makes 208 crank hp. I've seen 968 engines for $3000 not selling, and they make 236 hp.