Ok, as most of you guys know...i am building a 383 with all forged internals but after talking to my machinest i asked him if i was still at 9:1 compresh and he told me i was at 10:50?

So i was kind of mad :mad about that and he told me i should be fine running that kind of compresh since i have all forged goodies and being at mile high 10lbs should not be a problem? but he might be right...i know guys running stock LS-1's with 10psi and 75shot of NOS and turning 11's down here? so i dont know...what do you guys think?

 

the engine might be strong enough but your through running pump gas. your building a race gas motor..........at your altitude you lose one lb from sea level boost but you boost what ever your gadge is telling you your boosting........kevin now is the time to get that engine built the way YOU wanted it not the way the mechinest wants it....get new pistons at lower compression, you know its never enough and next it'll be a 150 nos shot. :cool:

 

:iagree: :iagree: :yesnod: :yesnod: :yesnod: :yesnod:
10.50c\r :nono: :nono:
9-1 or less :hurray:

 

Thats not cool at all..... Like the other guys said.... Get that thing to 9 or less. If your driving it everyday.

Its his fault, he knew you wanted the low comp motor and it was going to be superchargered correct???

Sorry to here about that and make it right.... Hope you work it out

 

:iagree:
That's a B.S. copout...If I ran my engine business like that I would have NO customers. I don't build what "I" want...I build what "they" want. I will make suggestions but in the end I follow what the customer wants (even if he's wrong, cuz he'll learn).

The altitude factor is a valid point to about 6 psi but since you're going for more than that (and you never know when you "might" get to run at a sea level track) and 10.50:1 is too high. Get him to rectify the problem if he won't; either kick his butt or get a lawyer...
-Jeb

 

Thanks guys...but get this... ok i asked him the first time and he said 10:50 now he said it is 10:1? i mean i am no engine rebuilding but is it that hard to find out what the compression ratio is? Also i talked to his other mechanic and he was telling me that running low boost is old school and running 10:1 or 11:1 is no big deal you just have to tune it perfect and you will be fine?

So i think i am going to go to bigger heads in the future and that should drop the compression alot because i have 58 CC heads and if i run to 70 CC heads that should help or what do you guys think? :yesnod:

 

:rolleyes: Sounds super sketchy to me man.....

But the new heads with say a 68cc chamber will drop the compression significantly. Which I guess you can look at it that way but.... You pay for what you want... not for what they think....

You can prob get away with running the 10.. or whatever the mystery comp is..... But you wont have room to add more boost without worry about detenation......

 

Krivera if it was me I would get that engine the hell out of their. You are dealing with a bunch of idiots. First it is 10:50 now 10-1 makes no difference both are too high for pump gas. He KNOWS what the c\r is he is just BS ing you. Not the kind of people you want to deal with. I hate to tell you this but it sure sounds like you are going to get screwed becuse if you demand he fix it then he will say it is 9-1 :mad

 

:iagree: :iagree: :iagree:

I'm no expert but I know on a boosted engine you want low compression which will allow you to go higher on the boost, thus giving MORE horsepower than with a higher compression and low boost setup.

DUDE! You have a D1, you can get up to 22PSI from that thing. I would plan for the future and get them to put the right compression pistons in there now.

 

:iagree: :iagree: :iagree: :iagree: :iagree: :iagree:
Get it right now kevin...............if your going after black bart horse power and you know you are and a daily driver get that compression down your spending big bucks don't micky mouse it. :smash:

 

Thanks guys you are right! i am calling him right now and chewing that ...(you know) :cuss so let me see what he has to say here in a minute and i will let you guys know! Also i know that really stinks because i know my D-1 can make super power for the street (no F-1 or nothing) and i will really be pist running 5 or 6 pounds because my motor is to high of compression!

WEll check this link on how to cook RICE below enjoy!
http://eurotuned.com/multimedia/gti_vs_civic.htm

i am sure you guys already have the cook book on this!

hee hheee :lol:

 

Ask him for the build sheet on the motor...Ie., the bearing blueprint specs, the bobweight card, the final bore diameter, the final deckheight, how far the pistons are "in the hole", what head gasket it is, and whether or not he's cc'd everything to insure that the dimensions are what the "book" says they are. I cc EVERYTHING because I have yet to find ANY manufacturer that says their product is right on the money and it really is...
-Jeb

 

:iagree: :iagree:

Jeb you are the kind of guy I could do business with.
Take nothing for granted verify everything.
:party:

 

Thank you... That was a VERY nice compliment. I'm extremely **** retentive about my engines (my own or my customers) because they reflect upon me. When you spend many thousands of dollars on a performance assembly you should KNOW everything that's in it, and if something needs to be fixed in the future and the original builder cannot do it there should be enough information for another competent shop to step in. I've never understood engine builders who don't do this or ones that keep combinations "secret." Let me tell you something, if you build an engine for me and won't tell me the cam specs on it (because you "THINK" it's a proprietary grind) then we have big problems...If I paid for it or if my customer pays for it they will KNOW everything about the damn thing...Even if their eyes glaze over while I'm describing it (which happens frequently)!
-Jeb :rant:

 

THANKS GUYS! ok i called him out and he is getting me a sheet and he said he already has every thing almost done on paper so he is going to give me my cam card, bore size, blah blah blah (technical talk). So i said that will work...i asked about the compression issue again and i guess it is kind of my fault because i told him i was going to go with AFR heads or Trick Flow or etc...so he built the motor for 9:1 for AFR something CC heads i think he said 200somthing?? so he said we will run the boost low until i get the money to get the better heads? So he was really kewl about it and after talking to about 10guys i know that have had there motors built by him they said he is all about looking 1 step further and so there is no issues when i run my bigger heads compression should drop and then i can run mucho boost! Also one guy was telling me that my engine builder is all about customer satisfaction and i guess he built a motor for a guy and the guy changed his mind after it was installed in the car to go to a 383 instead of a 350 and my machnic pulled the motor out (free of cost) built it and charged him th same for the 350 build? So as of right now we are cool but what is funny is i paid him 2500$ already and i ask him when does he want the rest of the money and he is like no worries when ever you feel youwant to give it to me...so for jokes i told him "how about next year" he says "Thats fine"? Damn must be nice to be rich!

Thanks guys! oh and black bart and jburnett...what size of heads should i go with? or what brand?????? my guy says AFR but what do you guys think and what size "CC"
Thanks! :party:

 

Thanks guys! oh and black bart and jburnett...what size of heads should i go with? or what brand?????? my guy says AFR but what do you guys think and what size "CC"
Thanks!

Well...When you find out what your pistons are, the deck height, and what head gasket you plan to use we can better answer that question... But, until then we don't know what we're playing with. AFR heads have combustion chambers ranging from 55cc's to 72cc's... The bigger the chamber the less your compression will be. Also he referred to "200(?)" when speaking of the AFR heads...Personally I would go with a set of 195 CNC AFR heads for a blown application; the somewhat smaller ports are more efficient in my opinion for boosted applications... You live in Denver?? I built a 383 for another Denver guy on this board; Mike Miller...You know him??
-Jeb

 

:iagree: :iagree: Yep Ole Jeb is right again not enough info to give advise other than on the brand. With a blower plus NOS AFR is what you want because not only do they flow better but they have one of the thickest heads for more strength. The AFR heads cost a little more but that is like the old saying that I like it goes like this.

{ If you want nice clean oats then you have to pay a fair price. }
( But if you can be satified with them after they have been through the horse then that is a little cheaper. ) :)

 

jbunett and black bart you guys rock! yeah i called him back and told him i was talking to other machnics and getting advice and he said that is a good thing to get all the input i can find...and i asked him about 195 AFR's and he said that is good for the street and it is a good head and can get them at a good price! but Matt Miller sounds really familiar??? i know that name but i would have to see his face! But thanks again guys for all your help!

 

MIKE Miller...He's RocketSled on here... He's in Parker, has a 98 C5 and an '89 Vert with one of my 383's in it.

I think you've gotten one over on your machinist. He KNOWS you're talking with some RKI's (Reasonably Knowledgable Individuals- sorry, that's what we call them in the gun biz) and will probably be a lot more straight forward with you... Once you get the correct figures let me know and I'll be happy to recommend what you need to go with.
-Jeb

 

Krivera Sounds like you are planing on the AFR 195 heads I hope that you didn't put flat top pistons in your motor because the afr 195 comes either 68 or 74cc and with the 74cc heads and flat top pistons your compression will be too high you will need dished pistons. That is why my engine has custom built pistons. I used the afr heads then made the pistons to get the C/R that I wanted. This should have all been worked out before you ever started on this project. I wish I had of knowin ahead of time what you were planning I could have saved you a lot of headaches. Do you know what pistons are in the engine now.????? Did he deck the block and make them flush with the deck or are they down ??????????? from flush this needs to be addressed NOW before you go any further. Bart