building my cih 2.5

[idarasheimhaga]

first of all i am sory four my bad english, im from norway.

parts i got.

-manta b gte/gsi block
-2.4 crank with 8 counter wights.
-2.4 stok rods
-wiseco forged pistons 12:1 compretion 97mm
-2.0 head from the manta
-2.2 head from record 2.2e
-2.4 head from omega 2.4
-the enem 4-2-1 exoust manifold (2.5)
-mekanikal lifters
-3.0 intake manifold thet i am going to cut down
-2.4 indjektors (i dont know what they ar caled, the ones that sprais fuel in to the engin)
-2.4 fuel rail
-umenitiun destrubitor whit som kind of laser. when the laser is cut it givs the spark. il put out som pic
-umenitium coil, stronger
-2.0 flyweel
-2.2 flyweel

parts i am bying:

-dubbel valve springs from enem
-aluminium retainers
-racing rods (is it neceseary?)
-crane roller rockers. found som four 700 dollar
- a cam thet will give me god power but this enging is going to be a fast every day car, so it has to be drivebal at low rpm.
-forged valves.

plan:

-to do som porting in one of the heads. but which on is the best to use?
-get the best parts to gether, so i get a god cih with god power

questions

-can i use an orginal head gasket whit 12:1 compretion?
-is ther somthing in my plan i shuld do another way using other parts?
-which head shuld i use?
-tips to a cam?

[idarasheimhaga]

her is som pic of the lumenition egnition system

http://www.opelmotorsport.com/forum/...&pictureid=523
http://www.opelmotorsport.com/forum/...&pictureid=522
http://www.opelmotorsport.com/forum/...&pictureid=536

her is the crank
http://www.opelmotorsport.com/forum/...&pictureid=511

[Hiro]

Hi there!
For a street 2.4 CIH I would use the following parts from your stock:
2.0 block overbored to 97mm & freshly decked,
97mm Wiseco pistons (but CR 12 is quite high for a street CIH),
reworked std 2.4 steel rods (weight match & deburr),
reworked 2.4 crank (remove 2kg & balance with FW/clutch cover),
reworked 2.0 flywheel (remove 2kg & fit a 228mm clutch & add dowel pins),
mildly ported 2.4 head (intake ports only),
race 40/45mm valves with alu retainers & 95kp single springs,
mild race camshaft (ie 290°-300° duration),
solid lifters with std steel rockers (no need for the Crane stuff),
race headgasket (various thickness are available @ Risse Motosport),
your Lumenition set & Enem 4/2/1 header.
This combo should give you a very nice street CIH with a broad powerband (3000rpm to about 6500rpm).
HTH,
Hiro

[idarasheimhaga]

sory four my bad english again, what does "solid lifters", "weight match & deburr", "steel rockers" and "freshly decked" mean?

but how will the power be on low rpm like 1500-3000.

but a lot of peopel say that i should port the exaust to, just round the edges and make it flow better but take off as little steel as plosibel. so how shuld i do the porting how much shuld i do. somone said i should mak them as big as the gasket, the intak manifoil to. is 12:1 compretion to muche? whats bad whit high compretion?

[idarasheimhaga]

found an interesting cam. 292 degreas, and valve lift 12.45mm its a copany in sweden that makes them. they also make roller rockers four cih

[GTJIM]

Originally Posted by idarasheimhaga sory four my bad english again, what does "weight match & deburr", "steel rockers" and mean? but how will the power be on low rpm like 1500-3000. but a lot of peopel say that i should port the exaust to, just round the edges and make it flow better but take off as little steel as plosibel. so how shuld i do the porting how much shuld i do. somone said i should mak them as big as the gasket, the intak manifoil to. is 12:1 compretion to muche? whats bad whit high compretion?

"solid lifters" = mechanikal

"Weight match and deburr" = Balance (make the same weight) and smooth & polish the sides

"steel Rockers" = Standard original Opel rockers

"freshly decked" = the top of the block machined flat by removing a small amount of metal

Don't touch the exhaust ports! The holes in the gasket are too big.
Look at the size of 1990-92 3.0L motor exhaust ports ports - the exhaust ones are the right size.

Your Engish is good - far better than my Norwegian!

[Hiro]

Originally Posted by idarasheimhaga but how will the power be on low rpm like 1500-3000. but a lot of peopel say that i should port the exaust to, just round the edges and make it flow better but take off as little steel as plosibel. so how shuld i do the porting how much shuld i do. somone said i should mak them as big as the gasket, the intak manifoil to. is 12:1 compretion to muche? whats bad whit high compretion?

the 2.5 has lots of torque so the 1500rpm to 3000rpm range will be OK too.
the 2.4 head already has very big exhaust ports for street CIH,
so don't port them because this may reduce the low-rpm torque.
high CR combined with a mild camshaft may cause detonation so this is not OK for a street CIH,
whereas on a full race CIH with very big camshaft a high CR is required to compensate for the big valve overlap.
for this reason the head porting & CR & camshaft duration will be different for a street CIH or a race CIH.
Hiro

[Hiro]

Originally Posted by idarasheimhaga found an interesting cam. 292 degreas, and valve lift 12.45mm its a copany in sweden that makes them. they also make roller rockers four cih

is this the TG Motor company?
yes this 292°/12.45mm camshaft seems suitable for your street 2.5
Hiro

[idarasheimhaga]

Originally Posted by Hiro is this the TG Motor company? yes this 292°/12.45mm camshaft seems suitable for your street 2.5 Hiro

yes it is. yes i think i am gona go four that cam. if i use this cam is it ok with 12CR and som porting inn the intake port our shuld i reduse the cr? shuld i not sand down the exost port so it is smother, just leav it alone?

i want it as powerfull as plosibel stil drivebel at road, i want to smok all the ugly import cars the engin is going into a kadett c. 3.55 gear ratio in the rear axle. using the manta 5speed gearbox

ehat does "dowel pins" mean.

does the lumenitium egnition system better then the orginal in aney ways?

i realy like to have a lot og torke going up hill. shuld i still use the 2.0 flyweel?

thanks a lot four good respons

[Gumby]

Originally Posted by idarasheimhaga yes it is. yes i think i am gona go four that cam. if i use this cam is it ok with 12CR and som porting inn the intake port our shuld i reduse the cr? shuld i not sand down the exost port so it is smother, just leav it alone? i want it as powerfull as plosibel stil drivebel at road, i want to smok all the ugly import cars the engin is going into a kadett c. 3.55 gear ratio in the rear axle. using the manta 5speed gearbox ehat does "dowel pins" mean. does the lumenitium egnition system better then the orginal in aney ways? i realy like to have a lot og torke going up hill. shuld i still use the 2.0 flyweel? thanks a lot four good respons

If you want to smoke the imports have you considered either a turbo or supercharger instead of high compression?

[idarasheimhaga]

Originally Posted by Gumby If you want to smoke the imports have you considered either a turbo or supercharger instead of high compression?

i know. but i do not want turbo on this engin. i want to lern how to tune engins. so then i start whit on with out turbo. later i am going to build a calibra turbo enging four my kadett c city whit 500 hp. but i am still going to school and its hard four me thats onley 17years to get money for a turbo engin.

[Gumby]

Originally Posted by idarasheimhaga i know. but i do not want turbo on this engin. i want to lern how to tune engins. so then i start whit on with out turbo. later i am going to build a calibra turbo enging four my kadett c city whit 500 hp. but i am still going to school and its hard four me thats onley 17years to get money for a turbo engin.

I don't know... increasing engine output via compression, higher rpm use, and displacement changes seem to be a lot more expensive than a properly tuned forced induction setup but it sounds like you are off to a good start with the parts you currently have.

[idarasheimhaga]

Originally Posted by Gumby I don't know... increasing engine output via compression, higher rpm use, and displacement changes seem to be a lot more expensive than a properly tuned forced induction setup but it sounds like you are off to a good start with the parts you currently have.

i like the low botom power you get with out turbo. 5 gear every wher. turbo neads low cr. then you loos power on low rpm

[OpelNewb]

I have had alittle experience running turbo setups and the Opel being a lightweight car has the potential to be a great turbo car. You just have to use a smaller turbo so it spools sooner. I had a Civic that I turbo'd and it made some pretty impressive power even the though the turbo was kinda big. If you choose carefully you can get it to start building pressure soon enough that the loss won't even be noticeable from having a lower cr. I ran 15psi I think the metric for that is about 1.5bar. I starting building pressure at about 2800rpm so it was very easy to drive on the street and did use alot of fuel. Keep the compression around 9 to 1 and turbo it. I love my 2008 Subaru STi it's fun to drive and the turbo is small enough and the exhaust flow is good enough to get the turbo spooling at a low rpm.

Turbo is cheaper than trying to build a CIH that will hold up to that kinda compression.

Unless you want to smoke tires all the time and drift I would go turbo. Someone once said this: " Turbo Lag is My Way of Giving the Other Guy a Head Start!"

[idarasheimhaga]

i think turbo would give me a litle mor power but i aam that drift person that likes going on low rpm ant trotle up. it feals so god

[idarasheimhaga]

aney more tips on what i can do to make it as powerfull as plosible. and does the lumenition egnition system give more power

[Gumby]

Originally Posted by idarasheimhaga i think turbo would give me a litle mor power but i aam that drift person that likes going on low rpm ant trotle up. it feals so god

This is why a supercharged 2.4/2.5 is good , besides forced induction greatly compensates for the inferior flowing heads of our CIH engines compared to other layouts (ex DOHC).

BTW will your gear box take the torque of a built up 2.5?

[idarasheimhaga]

ok. but i got so maney parts and i want to hav the engine whit out turbo. next engin will have turbo.

i herde there is a guy on this site name rally bob, they say he is the best cih tuner ever. help me rally bob. give me a list of what you whul have don if you had my parts and would make a realy powerfull street cih that is drivebal on low rpm. aney other parts i would nead

if the gear box goes to hell i just get a 265 from a monza our bmw

[namba209]

Originally Posted by idarasheimhaga i herde there is a guy on this site name rally bob, they say he is the best cih tuner ever. help me rally bob. give me a list of what you whul have don if you had my parts and would make a realy powerfull street cih that is drivebal on low rpm. aney other parts i would nead

Yes indeed RallyBob is considered to the best person to respond to your question. However, he has posted many pictures and threads on what he has done on the CIH engines, it would be faster, but not easier, to do a search for his head porting and engine modifications, they are all in this site, probably under engine performance modifications.

[kwilford]

Originally Posted by idarasheimhaga i herde there is a guy on this site name rally bob, they say he is the best cih tuner ever. help me rally bob. give me a list of what you whul have don if you had my parts and would make a realy powerfull street cih that is drivebal on low rpm. aney other parts i would nead

http://www.opelgt.com/forums/opel-te...re-cih-hp.html