Slant Six Forum
https://www.slantsix.org/forum/

300 Hp Slant 6?
https://www.slantsix.org/forum/viewtopic.php?t=36668		 Page 1 of 7
Author:  Shazzam66 [ Sun Aug 09, 2009 9:49 pm ]
Post subject:  300 Hp Slant 6?
For starters,

I'm new to this forum and this is my first post XD

I was wondering if it is at all possible to get close to 300 hp out of my 3.7 litre 225 Slant 6.

but heres the catch

without boring it and keeping it N/A.

feedback much appreciated.

p.s im from oz
Author:  Joshie225 [ Sun Aug 09, 2009 9:59 pm ]
Post subject: 
If your budget doesn't include boring the block your budget cannot include what you do need to make 250hp let alone 300. If you're excluding nitrous the answer is no, you will not be able to achieve 300hp NA with such a budget.
Author:  ceej [ Sun Aug 09, 2009 9:59 pm ]
Post subject: 
NA? Net?

How do you feel about nitrous?

:lol:

CJ
Author:  Shazzam66 [ Sun Aug 09, 2009 10:10 pm ]
Post subject: 
no giggle gas for me thanks

i never mentioned anything about budget

i would even be happy if i got 1hp for every 1 cubic inch
Author:  Joshie225 [ Mon Aug 10, 2009 5:47 am ]
Post subject: 
You may not have said budget, but a low budget the only reason to keep using worn out-of-round cylinders and old pistons. You're going to need to be explicit on what you want from the car as far as ET or driveability and your budget. Do you want that 225hp at the wheels?
Author:  theslantingsix [ Mon Aug 10, 2009 5:55 am ]
Post subject: 
i'm building a 300 horse slant to but i cant tell yall whats in it or i would have to shoot all of yall (i keep my builds under lock and key)
Author:  Shazzam66 [ Mon Aug 10, 2009 6:31 am ]
Post subject: 
okay forget the word BUDGET.

but i will take your advice on being explicit and specific as to what i want:

- I want my slant to being pushing as close to 300hp as i can get without: nitrous, super charging, turbo charging or EFIing or boring, just flat N/A

- I would like it to be a real V8 killer, david and goliath type stuff.

- I would like great streetability but for it to get up and really gallop when i push the pedal down.

and theslantingsix why even post if you can't offer me any advice, lol...
Author:  66aCUDA [ Mon Aug 10, 2009 6:42 am ]
Post subject: 
You will have to get your flow numbers up to 240/230 just to start. There is a lot of gain to be made in the head. I dont think it is realistic to get 300HP out of a Non bored slant. It will be hard enough to get it with a power adder.
Have FUN and try,
Frank
Author:  ceej [ Mon Aug 10, 2009 6:52 am ]
Post subject: 
Big compression, race gas, E-85 or alcohol, strip cam, very high stall converter, your going to need something special for induction and good headers. To get the primaries opened up enough you'll likely need to make your own. Oversized valves, electric fuel and water pump. Something evil for an ignition system. Lot's of care selecting parts.
300 hp naturally aspirated? A built 340 of like investment will still leave you in the dust.

A realistic expectation would be 250 crank hp, but it will have to be done right. An overbore would be helpful, if only to square the engine up a bit for a bit higher theoretical redline.

Use the search engine. This question gets asked a lot. Arbitrarily grabbing a number isn't the way to start a build.
Depends on what you mean by steetable. I'd say, no. Can't do it with a streetable car.

CJ
Author:  Shazzam66 [ Mon Aug 10, 2009 7:04 am ]
Post subject: 
rather then everyone telling me its unrealistic, could i please have some tips or some comparisons of options
Author:  66aCUDA [ Mon Aug 10, 2009 7:15 am ]
Post subject: 
I feel for you but you have gotten some good sugestions. I would start with this info and get a plan together. Crunch some numbers thru an on line calcutator and see where your at.
Just a thought. Then come back with a specfic set of questions.
Frank
Author:  Charrlie_S [ Mon Aug 10, 2009 8:57 am ]
Post subject: 
Quote:
rather then everyone telling me its unrealistic, could i please have some tips or some comparisons of options
There are no tips, because there is no way you can get what you want. If you want a V-8 killer with street manners, power adder is a must. Also there is absolutly no sense trying to build an engine like you are asking for, without boring to get the cylinders round and true, for a good ring seal. To make big power numbers, you must start with a good basic short block, that seals the compression. You are starting out with a cubic inch disadvantage to the V-8s, and an RPM disadvantage to the imports. So why handicap yourself further with cylinders that will not seal. You will need round and straight holes, light piston and rod assy, and the best ring package available. Then go from there.
Author:  Dart270 [ Mon Aug 10, 2009 9:13 am ]
Post subject: 
Rather than focusing on HP, can you tell us what 1/4 mile time you would like to achieve, and how much your car will weigh or what kind of car?

Most people think you need 300 HP to do 14 sec 1/4 miles, but that is far away from the truth. 230 HP can get you to the 14s, which is doable with a streetable (but a bit radical) NA Slant and a fairly light car.

Thanks,

Lou
Author:  NCDemon1971 [ Mon Aug 10, 2009 9:24 am ]
Post subject: 
300hp will take lots of time and $$$.

Without a power adder, the streetability wont be there- In my opinion.

The 300hp mark will take about every modification you can do to your /6, and that will include boring it. You want a round/true cylinder bore to make max power. When you bore it, the rings do tend seal to the walls better with a smaller overbore (example- say .030 over vs. 040 or whatever is desired). It's the old, more cubic inches vs.rigidity debate.


It's gonna take compression as well. Lots of it. You might wanna consider
running alky to meet your desired hp :shock:

Lou (Dart270) makes a good point. Get the vehicle as light as possible to get the most out of it!
Author:  theslantingsix [ Mon Aug 10, 2009 9:29 am ]
Post subject: 
check out my cardomain for some ideas (pages 3&4) i was just messin with you. i'm going for the erson 270 cam which will be degreed, major back yard port and polish, in 1.77, ex 1.44 valves , .100 off the head .30 over, underdrive pulleys (check out jegs under march pullys and use the small block water pump pully), eletric fan, offy intake, holley 390, clifford headers, (at this point i want to be pushing 300hp) and after that a shot of nos.

and the budget always goes away my budget on this engine was gone $1000 dollars ago, and i'm going to spend more
Page 1 of 7 All times are UTC-07:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/